Add issue templates for the entire org

[dcmiddle]

Adding issue templates to the .github repo makes them available in all OPEA repositories. Templates improve the quality of bug reports and feature requests.

[dbkinder]

Thanks for contributing this Dan, and appreciate you did the Signed-off-by line :)
Are the reviewers OK with this global PR/Issues template? I wasn't sure if this would overwrite any specific repo's templates.

[dcmiddle]

I believe each repo can override the org level templates by specifying their own.

[dcmiddle]

Hi, I received offline feedback to look at Langchain's feature request template. It appears to not be an issue template but a link to a discussion board. https://github.com/langchain-ai/langchain/discussions/categories/ideas

I don't have experience with the discussions feature so I can't provide guidance how best to use that mechanism.
My recommendation is to provide issue templates for bugs and feature requests. I imagine that if the number of feature requests grows too rapidly that would be a sign to switch to a discussion board.

cc: @arun-gupta @chickenrae

[arun-gupta]

@dcmiddle here is the template that I shared in email https://github.com/langchain-ai/langchain/issues/new/choose

[dcmiddle]

Thanks for the clarification @arun-gupta. I believe that view is defined by the issue templates and a config.yml that adds links for things like discussions which aren't otherwise defined by issue templates. I think if we merge this PR as is then a menu will be produced.

See for example langchain defines 3 issue templates {bug, doc, and priv} here:
https://github.com/langchain-ai/langchain/tree/master/.github/ISSUE_TEMPLATE

As well as a config.yml to cover other topics via discussions:
https://github.com/langchain-ai/langchain/blob/master/.github/ISSUE_TEMPLATE/config.yml

[dcmiddle]

Any other feedback?

[arun-gupta]

@kding1 any thoughts on this?