clone repo along with openpoints

[jaswanthbjk]

What does this PR do?

Modify README to clone the repo along with openpoints which is a dependency

Fixes #\

Before submitting

• [x] Did you make sure title is self-explanatory and the description concisely explains the PR?
• [x] Did you make sure your PR does only one thing, instead of bundling different changes together?
• [x] Did you list all the breaking changes introduced by this pull request?
• [x] Did you test your PR locally with pytest command?
• [x] Did you run pre-commit hooks with pre-commit run -a command?

Did you have fun?

Make sure you had fun coding 🙃

[leo-stan]

https://git-scm.com/book/en/v2/Git-Tools-Submodules#:~:text=If%20you%20pass%20%2D%2Drecurse,the%20repository%20have%20submodules%20themselves. Yep seems that --recurse-submodules is the way to go :)

[leo-stan]

@jaswanthbjk thanks for your contribution! If you have any more time to give to the project feel free to reach out :)

[jaswanthbjk]

@leo-stan thanks for the merge. I am already in contact with @CCInc and will be starting to contribute at a slower pace.