Feature/docs (#165)

* initial readthedocs commit

* docs moved to sphinx / rst / read the docs

docs/features/logging.rst

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+Logging
+=======
+
+Ocelot uses the standard logging interfaces ILoggerFactory / ILogger<T> at the moment. 
+This is encapsulated in  IOcelotLogger / IOcelotLoggerFactory with an implementation 
+for the standard asp.net core logging stuff at the moment. 
+
+There are a bunch of debugging logs in the ocelot middlewares however I think the 
+system probably needs more logging in the code it calls into. Other than the debugging
+there is a global error handler that should catch any errors thrown and log them as errors.
+
+The reason for not just using bog standard framework logging is that I could not 
+work out how to override the request id that get's logged when setting IncludeScopes 
+to true for logging settings. Nicely onto the next feature.