chore(git): add some important files in .gitignore.
chore(git): add some important files in .gitignore.

Add files to .gitignore, taken from the following link:
https://github.com/github/gitignore/blob/master/Global/Eclipse.gitignore

laurentpetit/ccw,michelangelo13/ccw,michelangelo13/ccw,michelangelo13/ccw,laurentpetit/ccw,laurentpetit/ccw,noncom/ccw,noncom/ccw,ccw-ide/ccw,noncom/ccw,ccw-ide/ccw,ccw-ide/ccw