Add a note for warpctc's example 'python lstm_ocr.py' (apache#4133)

* Update README.md Add a note for lstm_ocr.py file. * Update README.md Add note.
liyangdev · Dec 11, 2016 · 9622714 · 9622714
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diff --git a/example/warpctc/README.md b/example/warpctc/README.md
@@ -34,6 +34,9 @@ I implement two examples, one is just a toy example which can be used to prove c
   cd examples/warpctc
   python lstm_ocr.py
 ```
+Note:
+* Please modify ```contexts = [mx.context.gpu(1)]``` in this file according to your hardware. If you only have one GPU pelase change 1 to 0(which GPU is selected.)
+* Please copy your font file to current folder. And instend of './data/Xerox.ttf' by your font file name. Maybe you can get a font from /usr/share/fonts/truetype/ in ubuntu.
 
 The OCR example is constructed as follows: