Added readme

README.rst

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+This is a D port of nicodjimenez minimal lstm python example found at
+http://github.com/nicodjimenez/lstm
+
+You get the best performance when compiling with with ldc in release mode.
+The according dub call would be:
+
+
+```
+    dub -b ldmd2
+```
+
+**NOTE** The required version to compile mir (a library we use for this example)
+is **1.1.0-beta2** (at this time, anyway). Check
+https://github.com/ldc-developers/ldc for more information
+
+
+I found that the python example takes **0.18s** to run and with the proper
+optimization the D example takes **0.11s**.