Normalize comment sample

comment-sample/.vscode/launch.json

@@ -6,7 +6,7 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "Extension",
+            "name": "Run Extension",
             "type": "extensionHost",
             "request": "launch",
             "runtimeExecutable": "${execPath}",

comment-sample/README.md

@@ -6,4 +6,11 @@ This sample shows
 - How to support comment thread creation for documents.
 - How to update comment actions dynamically.
 
-![demo](./wiki-demo.gif)
+![demo](./wiki-demo.gif)
+
+## Running the Sample
+
+- Run `npm install` in terminal to install dependencies
+- Run the `Run Extension` target in the Debug View. This will:
+	- Start a task `npm: watch` to compile the code
+	- Run the extension in a new VS Code window