Adding a script to build m2e project

A script to build m2e project locally

requested review from @mbarbero and @netomi

assigned to @mbarbero, @netomi, and @fcojperez

I'm not sure this repo should be used to store one-shot utility script. This one is very specific to m2e-core and for your experimentations only, so I'd push those to your personal account @ gitlab.eclipse.org. WDYT?

For this specific script, I think it could be greatly simplified with https://cli.github.com/manual/gh_pr_checkout

closed

Thanks for the feedback and I agree, closing then