Add GitHub issue templates

[j8r]

Implements a suggestion posted in the forum.

The main goal is to simplify issue creation, and limit questions unrelated directly to the language being posted in the bug tracker by redirecting users to the correct places to post their questions/issues.

I changed the default branch of my fork to have a preview: https://github.com/j8r/crystal/issues/new/choose.

This is a rough starting-point, core members will certainly have better template ideas that fits more the project.

[bcardiff]

I like it!

I'm not sure if the language improvement discussion should be encouraged to happen here or in the forum (https://forum.crystal-lang.org/c/crystal-contrib). The motivation would be to aim for actionable issues as much as possible.

Another thing that could be done is split the bug & features regarding std-lib or compiler. Splitting that can help to apply initial labels. But I'm not sure it's worth it.

[straight-shoota]

This is great!

@bcardiff I might like separation between stdlib and compiler, but it also increases complexity. For a user (especially a novice) it might be difficult to tell where the bug actually originates. So I'd rather leave it combined (at least for now, maybe we get better ideas later).

@j8r I don't see the difference between Language Improvement Discussion and Feature Request. What was your idea for having two separate entries?

[j8r]

@straight-shoota I was finding an issue category more general, which is usually more about an idea than a real feature proposal.

[asterite]

This is great! I didn't even know this was possible.

[j8r]

There is also pull request templates.
It will be a bit less useful than issue templates, but would be definitely a good-to-have.
I can post a PR after this one.

[straight-shoota]

I just think that it's not clear what exactly distinguishes I want to start a new discussion about improving the language from I want to propose a new language feature. These descriptions have a fair part of overlap.

Also we should probably consider using the expression language or stdlib to make sure it's not only about the language itself.

[j8r]

For example, what kind of issue would be "Getting rid of Errno", or any issue related to cleanups/enhancements? That's not really feature proposal.

[j8r]

Can we move forward this, what are the core members' suggestion?
Please if you agree on a category, commit it here.

[straight-shoota]

Let's merge this.

[sdogruyol]

IMHO This is great for last User Experience 👍 Thanks @j8r 🙏