Adding readme to LSTM code

JAppleyard · JAppleyard · commit e43306687ef3 · 2016-04-06T14:42:36.000-07:00
diff --git a/posts/rnn/README.md b/posts/rnn/README.md
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+## Optimized LSTM forward pass in CUDA
+
+This code implements an LSTM forward pass in CUDA using cuBLAS. It uses cuRand to initialize the inputs and parameters.
+
+The PERFOPTS define allows the user to select which optimizations are enabled. It is a bitmask taking values from 0 to 31 with each bit defining whether a particular optimization is enabled.
