Add built-in language grammar extensions for C#, F#, HTML, and Javascript. (#18216)

extensions/csharp/.vscodeignore

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+test/**
+cgmanifest.json

extensions/csharp/cgmanifest.json

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+{
+	"registrations": [
+		{
+			"component": {
+				"type": "git",
+				"git": {
+					"name": "dotnet/csharp-tmLanguage",
+					"repositoryUrl": "https://github.com/dotnet/csharp-tmLanguage",
+					"commitHash": "16612717ccd557383c0c821d7b6ae6662492ffde"
+				}
+			},
+			"license": "MIT",
+			"version": "0.1.0",
+			"description": "The file syntaxes/csharp.tmLanguage.json was derived from https://github.com/dotnet/csharp-tmLanguage"
+		}
+	],
+	"version": 1
+}

extensions/csharp/language-configuration.json

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+{
+	"comments": {
+		"lineComment": "//",
+		"blockComment": ["/*", "*/"]
+	},
+	"brackets": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"]
+	],
+	"autoClosingPairs": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"],
+		{ "open": "'", "close": "'", "notIn": ["string", "comment"] },
+		{ "open": "\"", "close": "\"", "notIn": ["string", "comment"] }
+	],
+	"surroundingPairs": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"],
+		["<", ">"],
+		["'", "'"],
+		["\"", "\""]
+	],
+	"folding": {
+		"markers": {
+			"start": "^\\s*#region\\b",
+			"end": "^\\s*#endregion\\b"
+		}
+	}
+}

extensions/csharp/package.json

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+{
+  "name": "csharp",
+  "displayName": "%displayName%",
+  "description": "%description%",
+  "version": "1.0.0",
+  "publisher": "vscode",
+  "license": "MIT",
+  "engines": {
+    "vscode": "0.10.x"
+  },
+  "scripts": {
+    "update-grammar": "node ../node_modules/vscode-grammar-updater/bin dotnet/csharp-tmLanguage grammars/csharp.tmLanguage ./syntaxes/csharp.tmLanguage.json"
+  },
+  "contributes": {
+    "languages": [
+      {
+        "id": "csharp",
+        "extensions": [
+          ".cs",
+          ".csx",
+          ".cake"
+        ],
+        "aliases": [
+          "C#",
+          "csharp"
+        ],
+        "configuration": "./language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "csharp",
+        "scopeName": "source.cs",
+        "path": "./syntaxes/csharp.tmLanguage.json"
+      }
+    ],
+    "snippets": [
+      {
+        "language": "csharp",
+        "path": "./snippets/csharp.code-snippets"
+      }
+    ]
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/microsoft/vscode.git"
+  }
+}

extensions/csharp/package.nls.json

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+{
+	"displayName": "C# Language Basics",
+	"description": "Provides snippets, syntax highlighting, bracket matching and folding in C# files."
+}

extensions/csharp/snippets/csharp.code-snippets

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+{
+	"Region Start": {
+		"prefix": "#region",
+		"body": [
+			"#region $0"
+		],
+		"description": "Folding Region Start"
+	},
+	"Region End": {
+		"prefix": "#endregion",
+		"body": [
+			"#endregion"
+		],
+		"description": "Folding Region End"
+	}
+}

extensions/csharp/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+