updates contribution section in the README
mentions ruby version and fixes formatting

+ fixes #24
adds general section

+ extends information on ruby version
+ clarify to edit the config.yml file
+ fixes typo of infopark console
+ only suggests rbenv and links to its webpage
+ mentions testing section above and adds that the dashboard and the generators are tested
integrates feedback
integrates feedback
Merge branch 'feature/contributing' into develop

* feature/contributing:
  integrates feedback
  integrates feedback
  + fixes typo of infopark console + only suggests rbenv and links to its webpage + mentions testing section above and adds that the dashboard and the generators are tested
  adds general section
  mentions ruby version and fixes formatting
  updates contribution section in the README