Add github-authentication-sample

github-authentication-sample/README.md

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+# GitHub Authentication Sample
+
+This is a GitHub authentication example that shows you how to use VS Code API authentication API.
+
+## Demo
+
+![demo](demo.png)
+
+## VS Code API
+
+### `vscode` module
+
+- [`authentication.getSession`](https://code.visualstudio.com/api/references/vscode-api#authentications.getSession)
+
+## 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