added small readme

README.md

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+Summary
+==============
+A small wrapper library to extract activations of deep neural networks using the popular Caffe toolbox.
+
+Requirements / Dependencies
+==============
+* A compiled version of Caffe, tested with 2016-08-20 (hash 14643685a4693df0ea8364f468821 )
+* The source code was developed in Matlab 8.2
+
+Installation
+==============
+* setup required paths and 3rd-party dependencies via `initWorkspaceCaffeTools.m` (if caffe is not found on your system, a possible code mirror is suggested)
+
+Common errors
+==============
+* Do not forget to add caffe's dependencies (e.g., cuda, gflgs, protobuf, leveldb, lmdb, and mkl) to your LD_LIBRARY_PATH and PATH variable before starting Matlab
+