Add some advice about how to manage projects' issues

[Okazari]

I would like to ...

• to add content

What is the section concerned ?
Keep your users => Maintain your project, process opened issues

What is the point concerned ?
I think we could add some advice about how to manage the projects issues.

What would you like to add or modify ?
We could add a mention to issue template if the project is under github ? Maybe some others things i don't know ;)

[ksenginew]

According to The Ruby on Rails contribution guidelines.

Did you find a bug?

• Do not open up a GitHub issue if the bug is a security vulnerability
• If you're unable to find an open issue addressing the problem, open a new one.

Do you intend to add a new feature or change an existing one?

• Suggest your change in the rubyonrails-core mailing list and start writing code.

• Do not open an issue on GitHub until you have collected positive feedback about the change. GitHub issues are primarily intended for bug reports and fixes.

Do you have questions about the source code?

• Ask any question about how to use Ruby on Rails in the rubyonrails-talk mailing list.

Github discussions is a good alternative to mailing list.

Looks like a good answer to this issue.