Merge pull request #10264 from backstage/freben/template-readmes

add readmes in the original packages and plugins folders

.changeset/perfect-phones-roll.md

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+---
+'@backstage/create-app': patch
+---
+
+Add helpful README.md files in the original `packages` and `plugins` folders

packages/create-app/templates/default-app/packages/README.md

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+# The Packages Folder
+
+This is where your own applications and centrally managed libraries live, each
+in a separate folder of its own.
+
+From the start there's an `app` folder (for the frontend) and a `backend` folder
+(for the Node backend), but you can also add more modules in here that house
+your core additions and adaptations, such as themes, common React component
+libraries, utilities, and similar.

packages/create-app/templates/default-app/plugins/README.md

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+# The Plugins Folder
+
+This is where your own plugins and their associated modules live, each in a
+separate folder of its own.
+
+If you want to create a new plugin here, go to your project root directory, run
+the command `yarn backstage-cli create`, and follow the on-screen instructions.
+
+You can also check out existing plugins on [the plugin marketplace](https://backstage.io/plugins)!