add an extension sample for the cli test runner (#918)

* add an extension sample for the cli test runner

* Add video demo

helloworld-test-cli-sample/src/extension.ts

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+// The module 'vscode' contains the VS Code extensibility API
+// Import the module and reference it with the alias vscode in your code below
+import * as vscode from 'vscode';
+
+// this method is called when your extension is activated
+// your extension is activated the very first time the command is executed
+export function activate(context: vscode.ExtensionContext) {
+	// Use the console to output diagnostic information (console.log) and errors (console.error)
+	// This line of code will only be executed once when your extension is activated
+	console.log('Congratulations, your extension "helloworld-sample" is now active!');
+
+	// The command has been defined in the package.json file
+	// Now provide the implementation of the command with registerCommand
+	// The commandId parameter must match the command field in package.json
+	const disposable = vscode.commands.registerCommand('extension.helloWorld', () => {
+		// The code you place here will be executed every time your command is executed
+
+		// Display a message box to the user
+		vscode.window.showInformationMessage('Hello World!');
+	});
+
+	context.subscriptions.push(disposable);
+}

helloworld-test-cli-sample/src/test/suite/extension.test.ts

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+import * as assert from 'assert';
+
+// You can import and use all API from the 'vscode' module
+// as well as import your extension to test it
+import * as vscode from 'vscode';
+// import * as myExtension from '../../extension';
+
+suite('Extension Test Suite', () => {
+	vscode.window.showInformationMessage('Start all tests.');
+
+	test('Sample test', () => {
+		assert.strictEqual([1, 2, 3].indexOf(5), -1);
+		assert.strictEqual([1, 2, 3].indexOf(0), -1);
+	});
+});