Need validation while creating marbles.

[susmitasomanchi]

Goto Marbles app.
Click on + icon to Create Marble.
Do not enter color and size
Click on create button.
An error is displayed .
So there should be a validation for creating a marble ,here are two options.

1. Disable create icon until user selects color and size.
2. When user clicks on create button display a validation message stating please select color and size of the marble.