[BUGFIX] add documentation to gitignore
[BUGFIX] add documentation to gitignore

closes #126

OpenSourceWorkflow/generator-kickstart,OpenSourceWorkflow/generator-kickstart,markusfalk/generator-kickstart,markusfalk/generator-kickstart,markusfalk/generator-kickstart,OpenSourceWorkflow/generator-kickstart,webit-de/generator-kickstart,webit-de/generator-kickstart