doc: Adding initial version of README.md (with how to create an effective issue report)

[czp13]

Description

Adding some text/thoughts about how to create an effective, useful, and clear issue report.

Type of change

• [ ] Bugfix
• [x] Feature

Checklist

• [x] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [x] I have added a description following the guideline.
• [x] The issue is created in the corresponding repository and I have referenced it.
• [x] I have added tests to ensure my change is effective and works as intended.
• [x] New and existing tests are passing locally with my change.
• [x] I have performed self-review and corrected misspellings.

Additional for Feature type of change

• [x] Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[MarcinVaadin]

I think it would be easier to create issue template rather than describe all steps in readme.

[czp13]

I think it would be easier to create issue template rather than describe all steps in readme. Can we do both? :D

Or shall I push these changes to the issue template?

[MarcinVaadin]

I cannot modify issue template @Artur- please update permissions

[Artur-]

Try now

[MarcinVaadin]

I still don't see them, they should be in "Issues" which I don't have https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository

[czp13]

Works for me!