Add Visual Studio Code extension recommendations.

.vscode/extensions.json

@@ -0,0 +1,18 @@
+{
+	// See http://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		"bierner.github-markdown-preview",
+		"DavidAnson.vscode-markdownlint",
+		"dbaeumer.vscode-eslint",
+		"esbenp.prettier-vscode",
+		"HookyQR.minify",
+		"yzhang.markdown-all-in-one"
+	],
+	// List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+	"unwantedRecommendations": [
+		
+	]
+}