Add preset columns for author and title

Author: pranavpandey

dynamic-theme/src/main/java/com/pranavpandey/android/dynamic/theme/ThemeContract.java

@@ -105,6 +105,16 @@ public class ThemeContract {
              */
             String _ID = BaseColumns._ID;
 
+            /**
+             * Column name for the preset author.
+             */
+            String AUTHOR = "author";
+
+            /**
+             * Column name for the preset title.
+             */
+            String TITLE = "title";
+
             /**
              * Column name for the preset theme string.
              */