Structure documentation in /docs

docs/reference/createPlugin.md

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+# createPlugin
+
+Taking a plugin config as argument and returns a new plugin.
+
+## Plugin Config
+
+```typescript
+function createPlugin(config: PluginConfig): BackstagePlugin;
+
+type PluginConfig = {
+  id: string;
+  register?(hooks: PluginHooks): void;
+};
+
+type PluginHooks = {
+  router: RouterHooks;
+};
+```
+
+[Read more about the router here](createPlugin-router.md)
+
+## Example Uses
+
+### Creating a basic plugin
+
+Showcasing adding multiple routes and a redirect.
+
+```jsx
+import { createPlugin } from '@spotify-backstage/core';
+import ExampleComponent from './components/ExampleComponent';
+
+export default createPlugin({
+  id: 'new-plugin',
+  register({ router }) {
+    router.registerRoute('/new-plugin', ExampleComponent);
+  },
+});
+```
+
+[Back to References](README.md)