added documentation for Hugging Face Estimator (aws#2234)

Author: IvyBazan

doc/frameworks/huggingface/index.rst

@@ -0,0 +1,11 @@
+############
+Hugging Face
+############
+
+A managed environment for training using Hugging Face on Amazon SageMaker. For more information about Hugging Face on Amazon SageMaker, as well as sample Jupyter notebooks, see `Use Hugging Face with Amazon SageMaker <https://docs.aws.amazon.com/sagemaker/latest/dg/hugging-face.html>`_.
+For general information about using the SageMaker Python SDK, see :ref:`overview:Using the SageMaker Python SDK`.
+
+.. toctree::
+    :maxdepth: 2
+
+    sagemaker.huggingface

doc/frameworks/huggingface/sagemaker.huggingface.rst

@@ -0,0 +1,10 @@
+HuggingFace
+===========
+
+HuggingFace Estimator
+---------------------
+
+.. autoclass:: sagemaker.huggingface.estimator.HuggingFace
+    :members:
+    :undoc-members:
+    :show-inheritance:

doc/frameworks/index.rst

@@ -9,6 +9,7 @@ The SageMaker Python SDK supports managed training and inference for a variety o
 
     mxnet/index
     chainer/index
+    huggingface/index
     pytorch/index
     rl/index
     sklearn/index