Add GitHub Issue Form

[frenck]

Proposed change

Adds the first iteration of a GitHub issue form, which is largely based on the original issue template.
The original issue template has moved up a folder, matching the old issue template structure (this prevent by-passing of the form just a bit more).

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io