Added files-path

Fixed Failed to find configured root exception

#116

Author: Dhaval2404

imagepicker/src/main/res/xml/image_picker_provider_paths.xml

@@ -3,4 +3,7 @@
     <external-path
         name="external_files"
         path="." />
+    <files-path
+        name="internal_files"
+        path="." />
 </paths>