Add note regarding "Fork first" if not sure what branch to use or where to edit

[timmwille]

Git workflow Guide related

https://github.com/ASKnetCommunity/ASKnet.Community/wiki/Git-Workflow

[timmwille]

I've also added a note here #115 that also solves #93 kind of?

https://github.com/ASKnetCommunity/ASKnet.Community/wiki/Pull-Request