Add VSC workspace rule

* The root workspace limits the ruler to 120 characters for member documentations and excludes folders such as 'samples' and 'docs'.
* The docs workspace limits the ruler to 70 characters for standard conceptual article to comply with documentation's CONTRIBUTING.md rule, and excludes temprorary folders created by DocFX.

Discord.Net.code-workspace

@@ -0,0 +1,23 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"editor.rulers": [
+			120
+		],
+		"files.exclude": {
+			"**/.git": true,
+			"**/.svn": true,
+			"**/.hg": true,
+			"**/CVS": true,
+			"**/.DS_Store": true,
+			"docs/": true,
+			"**/obj": true,
+			"**/bin": true,
+			"samples/": true,
+		}
+	}
+}

docs/Discord.Net.Docs.code-workspace

@@ -0,0 +1,20 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"editor.rulers": [
+			70
+		],
+		"files.exclude": {
+			"**/.git": true,
+			"**/.svn": true,
+			"**/.hg": true,
+			"**/CVS": true,
+			"**/.DS_Store": true,
+			"obj/": true
+		}
+	}
+}