Create CONTRIBUTING.md

Author: joetannenbaum

CONTRIBUTING.md

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+# Contributing
+
+To get the extension running locally:
+
+```
+git clone https://github.com/laravel/vs-code-extension.git
+cd vs-code-extension
+npm install
+```
+
+-   Open the project in VS Code
+-   Open the command palette and search for "Debug: Start Debugging"
+-   A new VS Code window will open, you'll see "[Extension Development Host]" in the title
+-   Open any folder you'd like to test against
+-   Press `⌘ + R` to reload the Extension Development Host project and see changes
+
+## Of Note
+
+-   `console.log` will appear in your main VS Code "Debug Console" tab, _not_ the Extension Development Host window
+-   `info`, `error`, etc from `src/support/logger.ts` will show up in the "Output" tab (make sure to select "Laravel" from the list) of your Extension Development Host window
+
+## Testing the Parser
+
+The [PHP parser](https://github.com/laravel/vs-code-php-parser-cli) is a standalone binary that parses the PHP scripts for item detection and autocomplete.
+
+If you are making changes to the parser, follow the setup instructions from that repo and create an `.env` file at the root of the `vs-code-extension` with the full path to this variable set:
+
+`PHP_PARSER_BINARY_PATH=[FULL PATH TO DIRECTORY]/vs-code-php-parser-cli/php-parser`
+
+If you make changes to your `.env` file, you'll have to close the Extension Development Host and start debugging again.