Added TP3 notice

Author: spmallette

README.textile

@@ -1,5 +1,7 @@
 !https://github.com/tinkerpop/blueprints/raw/master/doc/images/blueprints-logo.png!
 
+*IMPORTANT* - TinkerPop is now a part of the Apache Software Foundation and "TinkerPop 3.x":http://tinkerpop.incubator.apache.org/ is the latest incarnation of The TinkerPop.  This project is TinkerPop 2.x and is in maintenance mode.  
+
 Blueprints is a "property graph model interface":http://github.com/tinkerpop/gremlin/wiki/Defining-a-Property-Graph. It provides implementations, test suites, and supporting extensions. Graph databases and frameworks that implement the Blueprints interfaces automatically support Blueprints-enabled applications. Likewise, Blueprints-enabled applications can plug-and-play different Blueprints-enabled graph backends.
 
 * Implementations: