Adding link to readthedocs

README.md

@@ -66,6 +66,11 @@ $ LD_LIBRARY_PATH=rccl-install/lib/ HSA_FORCE_FINE_GRAIN_PCIE=1 rccl-install/tes
 There are also other performance and error-checking tests for RCCL.  These are maintained separately at https://github.com/ROCmSoftwarePlatform/rccl-tests.
 See the rccl-tests README for more information on how to build and run those tests.
 
+## Library and API Documentation
+
+Please refer to the [Library documentation](http://rccl.readthedocs.io/) for current documentation.
+
+
 ## Copyright
 
 All source code and accompanying documentation is copyright (c) 2015-2018, NVIDIA CORPORATION. All rights reserved.