Automatic merge from submit-queue

Add a SUPPORT.md file for github

**What this PR does / why we need it**:

Github has recently added the ability to support a SUPPORT.md file that allows a project to point to support resources, similar to CONTRIBUTING.md

They support having SUPPORT.md in docs/ and .github but I figured it should be in root alongside CONTRIBUTING.md, but we can put it in one of those places if we want to keep the root clean. 

See also: 

https://help.github.com/articles/adding-support-resources-to-your-project/
https://github.com/blog/2400-support-file-support

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

Fixes https://github.com/kubernetes/community/issues/830