Change README from rst to markdown

Author: pcisar

python/README.md

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+# Firebird Butler Protocol Buffers
+
+This package contains Python modules for work with protocol buffers defined by various
+Firebird Butler [specifications](https://firebird-butler.readthedocs.io/en/latest/specifications.html).
+
+Currently ontains next modules:
+
+- firebird.butler.fbsd_pb2 for [Firebird Butler Service Definition](https://firebird-butler.readthedocs.io/en/latest/rfc/3/FBSD.html)
+- firebird.butler.fbsp_pb2 for [Firebird Butler Service Protocol](https://firebird-butler.readthedocs.io/en/latest/rfc/4/FBSP.html)
+- firebird.butler.fbdp_pb2 for [Firebird Butler Data Pipe Protocol](https://firebird-butler.readthedocs.io/en/latest/rfc/9/FBDP.html)