Ignore the temporary files generated while creating the target platform

Change-Id: Icf840c1c03ed60213c7330087d4ef62a73274d80
Add a Class Diagram

In this diagram, we can add or create the following concepts:
- Class
- Application
- Metadata
- Library

Change-Id: I11c5353f44939f43e4ccf5d1a87d3a2e4d0e3277
Bug-Url: https://github.com/dartdesigner/Dart-Designer/issues/15