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

extensions/fsharp/.vscodeignore

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+test/**
+cgmanifest.json

extensions/fsharp/cgmanifest.json

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+{
+	"registrations": [
+		{
+			"component": {
+				"type": "git",
+				"git": {
+					"name": "ionide/ionide-fsgrammar",
+					"repositoryUrl": "https://github.com/ionide/ionide-fsgrammar",
+					"commitHash": "3311701c243d6ed5b080a2ee16ada51540a08c50"
+				}
+			},
+			"license": "MIT",
+			"description": "The file syntaxes/fsharp.json was included from https://github.com/ionide/ionide-fsgrammar/blob/master/grammar/fsharp.json.",
+			"version": "0.0.0"
+		}
+	],
+	"version": 1
+}

extensions/fsharp/language-configuration.json

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

extensions/fsharp/package.json

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+{
+  "name": "fsharp",
+  "displayName": "%displayName%",
+  "description": "%description%",
+  "version": "1.0.0",
+  "publisher": "vscode",
+  "license": "MIT",
+  "engines": {
+    "vscode": "*"
+  },
+  "scripts": {
+    "update-grammar": "node ../node_modules/vscode-grammar-updater/bin ionide/ionide-fsgrammar grammars/fsharp.json ./syntaxes/fsharp.tmLanguage.json"
+  },
+  "contributes": {
+    "languages": [
+      {
+        "id": "fsharp",
+        "extensions": [
+          ".fs",
+          ".fsi",
+          ".fsx",
+          ".fsscript"
+        ],
+        "aliases": [
+          "F#",
+          "FSharp",
+          "fsharp"
+        ],
+        "configuration": "./language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "fsharp",
+        "scopeName": "source.fsharp",
+        "path": "./syntaxes/fsharp.tmLanguage.json"
+      }
+    ],
+    "snippets": [
+      {
+        "language": "fsharp",
+        "path": "./snippets/fsharp.code-snippets"
+      }
+    ]
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/microsoft/vscode.git"
+  }
+}

extensions/fsharp/package.nls.json

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

extensions/fsharp/snippets/fsharp.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/fsharp/yarn.lock

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