Clarify which build.gradle to modify

Author: juliangrosshauser

README.md

@@ -291,7 +291,7 @@ with
 #### Running Catalog Project
 
 1. Clone the repository. `git clone https://github.com/PSPDFKit/react-native.git`.
-2. Add dependencies to `android/build.gradle`.
+2. Add dependencies to `android/build.gradle` (not `samples/Catalog/android/build.gradle`).
 
     A complete list of the dependencies needed can be found in the [documentation](https://pspdfkit.com/guides/android/current/getting-started/integrating-pspdfkit/#toc_manual-library-file-integration) step 6, under `Manual library file integration`.
 For PSPDFKit 2.9.3 :