Add section on managing multiple Firestore databases

Author: pinkeshmars

docs/ff-integrations/database/cloud-firestore/getting-started.md

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+## Manage Databases
+
+You can also create multiple Firestore databases within a single Firebase project. This makes it easy to set up separate data environments, such as development, staging, and production, without needing to create and manage multiple Firebase projects.
+
+To create a new database, go to the **Firebase Console > Firestore Database** section. Click the button next to the default database, i.e, **Add database**. Choose a region and configure your security rules. Once the new database is created, you can switch between databases using the dropdown.
+
+Next, copy the new **Database ID** and navigate to **FlutterFlow > Settings and Integrations > Firebase > Advanced Settings**. Paste the ID into the **Firestore Database ID** input field. Finally, regenerate the config file. Your app will now use the newly created database.
+
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