Enforce to add empty folders lost by git

libs/android-support-appcompat-v7-exploded-aar/assets/.gitignore

@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore

libs/android-support-appcompat-v7-exploded-aar/src/.gitignore

@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore