contribution guide for docs

docs/CONTRIBUTING.md

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+# Contributing to Docs
+
+I don't really have any strict conditions for writing documentation, but just keep these few guidelines in mind:
+
+* Keep code samples in the `guides/samples` folder
+* When referencing an object in the API, link to it's page in the API documentation.
+* Documentation should be written in clear and proper English*
+
+\* If anyone is interested in translating documentation into other languages, please open an issue or contact me on Discord (`foxbot#0282`).
+
+### Compiling
+
+Documentation is compiled into a static site using [DocFx](dotnet.github.io/docfx/). You **must** install a version of DocFx that supports .NET Core. The latest build of that is [2.1.0-cli-alpha](https://github.com/dotnet/docfx/releases/tag/v2.1.0-cli-alpha).
+
+After making changes, compile your changes into the static site with `docfx`. You can also view your changes live with `docfx --serve`.