feat: added first workflow

[KhudaDad414]

Description

• For Issues, it uses the issues Graphql query.
• Since pull requests doesn't have a way to filter them by the author using pullRequests query, we are using the search query for PRs.
  Related issue(s)
  Resolves Remove welcome workflow and replace with something custom #73

[derberg]

@KhudaDad414 I left some comments. Looks good so far, just minor stuff

long term, once these calls are expensive we at least have a custom code we can influence and setup a kind of persistence, where we share information about contributors and can check with the API if user is on the list or not.

[derberg]

LGTM, just think that this workflow should be added here and we should not add a new file

[derberg]

Awesome stuff mate, great contribution as usual 🚀
Now merge and let us see how it works in action 🤞🏼 😄