Added an issue template to the repos
Added an issue template to the repos

Lately there are numerous issues being created where people don't
specify which Akka.Net version they are using, and other basic stuff.
This template uses the github issue template feature to make people
aware of these things. And will hopefully lead to a better quality of
issue reporting.

ali-ince/akka.net,simonlaroche/akka.net,heynickc/akka.net,Silv3rcircl3/akka.net,simonlaroche/akka.net,ali-ince/akka.net,amichel/akka.net,amichel/akka.net,Silv3rcircl3/akka.net,heynickc/akka.net