CONTRIBUTING.md

1. First way to contribute:
   1. Fork Repo and clone it
   2. Add your regex or update regex in the src
   3. update its corresponding README.md if there was, if there was not and you need to add more description create one.
   4. Write its tests in a separate file or in the existing one
   5. Make sure all tests passes (If there was a problem in other tests create a new issue and share your problem)
   6. Create a PR.
   7. We merge it as soon as possible
2. Second way to contribute:
   1. Create a new issue of proposal type