Add build_file_checksums.ser and modules.xml files.

Signed-off-by: Yousha <Yousha.A@Hotmail.com>

Android.gitignore

@@ -42,6 +42,9 @@ captures/
 .idea/dictionaries
 .idea/libraries
 .idea/caches
+# Android Studio 3 in .gitignore file.
+.idea/caches/build_file_checksums.ser
+.idea/modules.xml
 
 # Keystore files
 # Uncomment the following lines if you do not want to check your keystore files in.