readme for osx lib

Author: memo

libs/tensorflow/lib/osx/README.md

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+Download the library from 
+https://github.com/memo/ofxMSATensorFlow/releases
+
+If it doesn’t already exist, create a folder called ‘lib’ in your home folder. 
+
+Copy libtensorflow_cc.so into ~/lib
+(Make sure there’s a copy here too).
+
+Alternatively see below for other ways of installing shared libraries
+https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/UsingDynamicLibraries.html#//apple_ref/doc/uid/TP40002182-SW10