Removed outdated android debug layer information (needs to be reworked for gradle)

android/layers/README.md

@@ -1,15 +0,0 @@
-# Android validation layers
-
-Put the pre-built validation layers into the folder for the architecture you're targeting.
-
-E.g. for armeabi-v7a:
-
-- ./armeabi-v7a/libVkLayer_core_validation.so
-- ./armeabi-v7a/libVkLayer_object_tracker.so
-- ...
-
-After this, build the example you want validation to be enabled for with the "-validation" flag, e.g.:
-
-```
-build pbrtexture -validation
-```