Templates for issues and pull requests

[tarlepp]

We should add simple templates for issues and pull requests to make some guidelines for community. https://blog.github.com/2016-02-17-issue-and-pull-request-templates/

eg with issues:

• bug; yes/no
• feat; yes/no
• version that user is using
• plunker link to reporter to provide working example about issue

eg with pull requests:

• pr type; fix, feat, etc.
• bc break; yes/no
• which issue(s) this solves - if any

[tiesont]

Agreed. I will add this to the v5 ship list, unless you want it to happen sooner.