Update README.md

README.md

@@ -5,3 +5,10 @@ MATLAB Toolbox for Brain-Computer Interface Research
 
 This software was written at the Swartz Center for Computational Neuroscience, UCSD. This work was funded by the Army Research Laboratory under Cooperative Agreement Number W911NF-10-2-0022 and a gift from The Swartz Foundation (Old Field, NY).
 The design of BCILAB was inspired by a preceding toolbox (the PhyPA toolbox) written in 2006-'09 by C. Kothe with contributions from T. Zander at the Department for Human-Machine Systems, Berlin Institute of Technology.
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+Guide to branches
+-----------------
+* master is the stable branch; most of the code has been tested over several months
+* testing contains code that is currently being tested, or considered ready for testers; it is usually several months ahead of master and may contain a few buggy functions
+* devel is the current development branch: it is the most up-to-date branch that integrates all features, but is frequently partially broken -- not recommended for regular toolbox users
+* all other branches are "feature branches" that should not be checked out (most are inactive and have long been merged in, and some others contain half-finished code)