[Functionality] Having both 'Enter' and 'Done' functionality in the keypad while typing in the ND_NoteDetailScreen Activity

Actual Behavior: Right now, the keypad only has 'Done' key, which collapses the Keypad on being clicked. This was added as a replacement for 'Enter' key. But there is not functionality to do an new line with Enter key at the moment. 

Expected behavior: Create a new Enter button in the Keypad to do a new-line
