feat(docs): add issue templates for issues and pull requests

[donroyco]

Currently there are a lot of ways people adding issues and pull requests to this repository. It's great that they contribute to this repo, but I think it's better when that can be streamlined and every issue and/or PR provides the same information.

There's this GitHub Help article about issue and pull request templates which can help in setting this up.

I think a great example of issue templates are the ones from Angular Components and Moment.

[peterpeterparker]

@donroyco definitely a good idea 👍

furthermore, as our repo is a mono-repo, providing template would probably help to narrow the issue or feature reporting.

p.s.: if you or anyone would like to contribute and provide such templates, that would be of course wonderful 😃

[donroyco]

@peterpeterparker I just put an initial PR, please have a look.

[peterpeterparker]

awesome @donroyco thx you for your PR and ideas 👍

I just added some more components to the potential affected parts (see #540) but for the rest it's really super!