Add pointers to some speech recogntion papers.

speech_recognition/README.md

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+# Speech Recognition
+
+## External Papers
+
+[A tutorial on hidden Markov models and selected applications in speech recognition](http://people.sabanciuniv.edu/~berrin/cs512/reading/rabiner-tutorial-on-hmm.pdf)
+
+[Weighted Finite-State Transducers in Speech Recognition](http://www.cs.nyu.edu/~mohri/pub/csl01.pdf)
+
+[Decoding speech in the presence of other sources](http://www.ee.columbia.edu/~dpwe/pubs/BarkCE05-sfd-spcomm.pdf)