Investigate potential rst grammar to include as a built-in extension (#144680)

extensions/restructuredtext/package.json

@@ -0,0 +1,39 @@
+{
+	"name": "restructuredtext",
+	"displayName": "%displayName%",
+	"description": "%description%",
+	"version": "1.0.0",
+	"publisher": "vscode",
+	"license": "MIT",
+	"engines": {
+		"vscode": "*"
+	},
+	"scripts": {
+		"update-grammar": "node ../node_modules/vscode-grammar-updater/bin trond-snekvik/vscode-rst syntaxes/rst.tmLanguage.json ./syntaxes/rst.tmLanguage.json"
+	},
+	"contributes": {
+		"languages": [
+			{
+				"id": "restructuredtext",
+				"aliases": [
+					"reStructuredText"
+				],
+				"configuration": "./language-configuration.json",
+				"extensions": [
+					".rst"
+				]
+			}
+		],
+		"grammars": [
+			{
+				"language": "restructuredtext",
+				"scopeName": "source.rst",
+				"path": "./syntaxes/rst.tmLanguage.json"
+			}
+		]
+	},
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/microsoft/vscode.git"
+	}
+}