chore: initial extension setup

vsc-extension-quickstart.md

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+# Welcome to your VS Code Extension
+
+## What's in the folder
+
+* This folder contains all of the files necessary for your extension.
+* `package.json` - this is the manifest file in which you declare your extension and command.
+  * The sample plugin registers a command and defines its title and command name. With this information VS Code can show the command in the command palette. It doesn’t yet need to load the plugin.
+* `extension.js` - this is the main file where you will provide the implementation of your command.
+  * The file exports one function, `activate`, which is called the very first time your extension is activated (in this case by executing the command). Inside the `activate` function we call `registerCommand`.
+  * We pass the function containing the implementation of the command as the second parameter to `registerCommand`.
+
+## Get up and running straight away
+
+* Press `F5` to open a new window with your extension loaded.
+* Run your command from the command palette by pressing (`Ctrl+Shift+P` or `Cmd+Shift+P` on Mac) and typing `Hello World`.
+* Set breakpoints in your code inside `extension.js` to debug your extension.
+* Find output from your extension in the debug console.
+
+## Make changes
+
+* You can relaunch the extension from the debug toolbar after changing code in `extension.js`.
+* You can also reload (`Ctrl+R` or `Cmd+R` on Mac) the VS Code window with your extension to load your changes.
+
+## Explore the API
+
+* You can open the full set of our API when you open the file `node_modules/@types/vscode/index.d.ts`.
+
+## Run tests
+
+* Install the [Extension Test Runner](https://marketplace.visualstudio.com/items?itemName=ms-vscode.extension-test-runner)
+* Open the Testing view from the activity bar and click the Run Test" button, or use the hotkey `Ctrl/Cmd + ; A`
+* See the output of the test result in the Test Results view.
+* Make changes to `test/extension.test.js` or create new test files inside the `test` folder.
+  * The provided test runner will only consider files matching the name pattern `**.test.js`.
+  * You can create folders inside the `test` folder to structure your tests any way you want.
+
+## Go further
+
+ * [Follow UX guidelines](https://code.visualstudio.com/api/ux-guidelines/overview) to create extensions that seamlessly integrate with VS Code's native interface and patterns.
+ * [Publish your extension](https://code.visualstudio.com/api/working-with-extensions/publishing-extension) on the VS Code extension marketplace.
+ * Automate builds by setting up [Continuous Integration](https://code.visualstudio.com/api/working-with-extensions/continuous-integration).