feat(add-git-merge): add echo statement for merge entry addition

bin/add-git-merge

@@ -18,5 +18,6 @@ add-git-merge() {
     local merge_ref="$2"
     local submodule_path="$3"
 
+    echo "Add merge '${remote_name}=$merge_ref' entry for $submodule_path"
     git config -f .gitmodules --add merge."$submodule_path"."$remote_name" "$merge_ref"
 }