[FEATURE] add .gitignore for common file exclusions

porting what was in svn:ignore before
needs to be aplied to all branches separatly, once we agree

Change-Id: If03b9e4796604056acadf3bf662f7990c84ca8b5
Fixes: #13627
Reviewed-on: http://review.typo3.org/1096


Tested-by: Andreas Wolf <andreas.wolf@ikt-werk.de>
Reviewed-by: Steffen Ritter <info@rs-websystems.de>
Tested-by: Steffen Ritter <info@rs-websystems.de>
Reviewed-by: Andreas Wolf <andreas.wolf@ikt-werk.de>