Create a documentation page explaining how to get started with and involved in iota2

We have a documentation which explains how to install and run some examples, but we should write an intro on how the iota2 "community" works:

• how to report bugs
• how to ask for help
• how to contribute small fixes to the doc
• how to ask for features

We can start with something similar to this https://groupes.renater.fr/wiki/parcelle/public/support_a_iota2