chore: add README

packages/external/README.md

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+## create-electron-app
+
+Create Electron App allows you to quickly bootstrap a new Electron app, using Electron Forge.
+
+### Usage
+
+Initialize a new project by running the following:
+
+```
+// yarn 1
+yarn create electron-app my-app
+
+// npm
+npx create-electron-app@latest my-app
+```
+
+You should now have a directory called my-app with an ultra-minimal Electron app boilerplate inside. If you head into that directory and start up the app, you'll be all set to start developing!
+
+```
+// yarn 1
+cd my-app
+yarn start
+
+// npm
+cd my-app
+npm start
+```