ADMIN: Create separate issue templates for different use cases
I recall this being mentioned on one of the core dev calls a few months back, and took inspiration from [rapidsai/cudf](https://github.com/rapidsai/cudf) for the various templates.

Added templates for the following use cases:
- Bug Report
  - This is largely the same as the current issue template
- Documentation Enhancement
- Documentation Error
- Feature Request
- Submit Question
  - This attempts to direct users to StackOverflow for usage questions

We could also add a Blank Template for opening an issue without any template provided, but opted not to do that for now, as I don't want to encourage people to bypass these templates.  Could certainly add one if there's a consensus that we want this.

I've created a [local repo](https://github.com/jschendel/pandas-templates/issues) where you can see these templates in action since I couldn't figure out another way to actually display these.  Click the "New Issue" button to see what these changes would look like.

cc @pandas-dev/pandas-core @pandas-dev/pandas-triage 
Nice idea. I think should consolidate the two Documentation templates into one. Also is there a way to just disallow submission of Usage Questions, instead just guiding people to the proper channel for those? A few comments:

1. I agree with @WillAyd about merging the two documentation ones
2. On the documentation bug report, you say to indicate the line number, but most people reading the docs won't be looking at the source, so I don't think we should ask for line numbers.  Maybe relevant section name.
3. I think we should give some guidance about how to include the python code.  It's never been clear to me whether it is better to include the input/output from an ipython session or from a regular python session. @jschendel still active? Closing as I think stale, but can reopen if something you want to pick up later @jschendel Do you mind if I revive this PR? @MomIsBestFriend : sure, go for it