How to make a meta data tag added to every application during compilation

[Know_About_IT]

Hello I want a metadata tag to be attached to every application compiled from my localhost. The tag is :

<meta-data
        android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="ca-app-pub-*******-*****"/> 

I know I need to modify :

mit-cml/appinventor-sources/blob/master/appinventor/buildserver/src/com/google/appinventor/buildserver/Compiler.java

I just need some guidance of you all

[AkshatRana]

Maybe this can help u

josejad/AppyBuilder/blob/master/AppyBuilder/appinventor-sources/appinventor/buildserver/src/com/google/appinventor/buildserver/Compiler.java