Add a tip somewhere on if you clone using Git BASH, but then want to work in an IDE

If someone clones using Git BASH, but then wants to work in e.g. R Studio, then they won't have the settings files (e.g. *.Rproj) to be open the repository.

It's simple to work around, but we could do with a tip somewhere along the lines of:

> if you clone with Git BASH and then want to work in R-Studio, then you'll need to start up RStudio and select File > New project... > Existing directory and then select the git-academy-sandbox folder that you just cloned

Don't think VS Code will have the same problem as you can just open any folder as a working directory. Not sure about PyCharm, will need to double check that one.

No file or entry point is named; first search the training materials for guidance on cloning with Git Bash and opening the repository in RStudio. Add the tip there, and consider the issue done when a learner can follow it to open the cloned folder as an RStudio project.

Written by the indexing model from the issue text.