JBRULES-2909 link the readme file in other repositories

README.md

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+Developing Drools and jBPM
+==========================
+
+**If you want to build or contribute to a droolsjbpm projects, [read this document](https://github.com/droolsjbpm/droolsjbpm-build-bootstrap/blob/master/README.md).**
+
+**It will save you and us a lot of time by setting up your development environment correctly.**
+It solves all known pitfalls that can disrupt your development.
+It also describes all guidelines, tips and tricks.
+If you want your pull requests (or patches) to be merged into master, please respect those guidelines.