Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to SlideWiki
+
+Many thanks for becoming involved in SlideWiki development! :+1:
+
+# Code contributions 
+
+We have an active Slack community on http://slidewiki.slack.com/ - do not hesitate to join and ask any question there.
+
+If you want to extend SlideWiki/add your own feature and want it to be part of the SlideWiki codebase, you can create a 
+Pull Request which will then be reviewed before merging.
+
+If you want to become active in developing the core features of SlideWiki we would be very happy :) 
+We have a JIRA system to keep track of issues, bugs, tasks, improvements, etc.. which you could then join.
+Please contact us on Slack, or via Github (people tab in the SlideWiki project), or via the project website slidewiki.eu. 
+
+SlideWiki.org is updated monthly with a new release, at least until december 2018. 
+Your changes will be visible there after the monthly update.  
+Merged PRs will be visible after a few minutes on platform.experimental.slidewiki.org thanks to our CI/CD :tada:
+
+One thing to note is that we use ESlint (see config files in root directory)
+
+How to run SlideWiki on your local machine is explained in the readme.md in the respective repositories (platform-UI and microservices)
+
+# Translating the User Interface 
+For translating the UI, we have a Transifex project at https://www.transifex.com/slidewiki/ 
+for which you can sign up and start translating.
+We download the translation results from Transifex and then update all languages at once 
+before we release once a month and update slidewiki.org.
+Storing the translations in Transifex helps us keep an overview.