Add github issue templates.

.github/ISSUE_TEMPLATE/blank_issue.yml

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+name: Blank Issue
+description: Submit an issue about Tensorflow.NET.
+labels: [Blank Issue]
+body:
+  - type: markdown
+    id: description
+    attributes:
+      label: Description
+      description: Please describe the issue here.
+      placeholder: Description
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        No matched issue template? Try the blank issue! We welcome submitting issues to Tensorflow.NET!

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: BUG Report
+description: Report a BUG of Tensorflow.NET.
+title: "[BUG Report]: "
+labels: [bug-report]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        We welcome bug reports! Any unexpected behavior could be a BUG and this template help us gather the information to fix it.
+  - type: markdown
+    id: background
+    attributes:
+      label: Description
+      description: Please share a clear and concise description of the problem.
+      placeholder: Description
+    validations:
+      required: true
+  - type: markdown
+    id: repro-steps
+    attributes:
+      label: Reproduction Steps
+      description: |
+        Please include minimal steps to reproduce the problem if possible. E.g.: the smallest possible code snippet; or a small project, with steps to run it. It will greatly help us to locate the reason of the problem.
+      placeholder: Minimal Reproduction
+    validations:
+      required: false
+  - type: markdown
+    id: known-workarounds
+    attributes:
+      label: Known Workarounds
+      description: |
+        Please provide a description of any known workarounds.
+      placeholder: Known Workarounds
+    validations:
+      required: false
+  - type: markdown
+    id: configuration
+    attributes:
+      label: Configuration and Other Information
+      description: |
+        Please provide more information on your configuration:
+          * Which version of Tensorflow.NET is the code depending on?
+          * Which version of .NET runtime is the code running on?
+          * What is the OS?
+          * Any other information about this problem?
+      placeholder: Configuration
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting the problem to us!

.github/ISSUE_TEMPLATE/documention_issue.yml

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+name: Documentation Issue
+description: Report an issue about Tensorflow.NET ducumention or require a documention.
+title: "[Documention Issue]: "
+labels: [Documention Issue]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Welcome to suggest to Tensorflow.NET documention! This template will help us gather the information we need to improve it.
+  - type: textarea
+    id: brief-description
+    attributes:
+      label: Brief Description
+      description: Please describe the problem or the requst for new documention here.
+      placeholder: Description
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: |
+        Please provide some alternative information here, if any.
+      placeholder: Alternatives
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your contributing!

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Request/Propose a new feature of Tensorflow.NET.
+title: "[Feature Request]: "
+labels: [feature-request]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        We welcome feature proposal/request! This template will help us gather the information we need to implement the new feature.
+  - type: markdown
+    id: background
+    attributes:
+      label: Background and Feature Description
+      description: Please describe the purpose and value of the new feature here. If the feature is linked to a specific problem, please describe it or put the link here.
+      placeholder: Purpose
+    validations:
+      required: true
+  - type: markdown
+    id: api-proposal
+    attributes:
+      label: API Definition and Usage
+      description: |
+        Please tell us the new API related to the requested feature, if any.
+      placeholder: API declaration (no method bodies)
+      value: |
+        ```cs
+        public Tensor NewFunc(Tensor x, int y);
+
+	  var result = NewFunc(input, index);
+        ```
+    validations:
+      required: false
+  - type: markdown
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: |
+        Please provide some alternative information of the feature, if any. For example, if you request a feature which depends on a specific device, please provide the device information.
+      placeholder: Alternatives
+    validations:
+      required: false
+  - type: markdown
+    id: risks
+    attributes:
+      label: Risks
+      description: |
+        Please mention any risks that to your knowledge the API proposal might entail, such as breaking changes, performance regressions, etc.
+      placeholder: Risks
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your contributing!

.github/ISSUE_TEMPLATE/performance_issue.yml

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+name: Performance Issue
+description: Submit an issue about performance problem or regression of Tensorflow.NET.
+title: "[Performance Issue]: "
+labels: [Performance Issue]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        We welcome issues about Tensorflow.NET performance! This template will help us gather the information we need to locate the problem improve the performance.
+  - type: textarea
+    id: brief-description
+    attributes:
+      label: Brief Description
+      description: Please give a brief description about the performance issue here.
+      placeholder: Description
+    validations:
+      required: true
+  - type: textarea
+    id: device-and-context
+    attributes:
+      label: Device and Context
+      description: |
+        Please describe the device and context you used when you encounter the performance problem/regression.
+      placeholder: Device and Context
+    validations:
+      required: true
+  - type: textarea
+    id: benchmark
+    attributes:
+      label: Benchmark
+      description: |
+        We will appreciate it if you'd like to provide benchmark comparison of the performance issue.
+      placeholder: Benchmark
+    validations:
+      required: false
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: |
+        Please provide some alternative information of the performance issue here, if any. For example, we'll appreciate it if you'd like to provide the the code to reproduce the performance problem.
+      placeholder: Alternatives
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your contributing!

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask any question about Tensorflow.NET and discuss with community members.
+title: "[Question]: "
+labels: [Question]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Any question about Tensorflow.NET is welcomed! This template will help us get your point.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please describe your question here.
+      placeholder: Description
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: |
+        Please provide some alternative information here, if any.
+      placeholder: Alternatives
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        We are always willing to answer your questions!