docs: add streaming html docs

docs/reference/bigframes.streaming/dataframe.rst

@@ -0,0 +1,6 @@
+bigframes.streaming.dataframe
+=============================
+
+.. autoclass:: bigframes.streaming.dataframe.StreamingDataFrame
+    :members:
+    :inherited-members:

docs/reference/bigframes.streaming/index.rst

@@ -0,0 +1,13 @@
+
+============================
+BigQuery DataFrame Streaming
+============================
+
+.. automodule:: bigframes.streaming
+    :members:
+    :undoc-members:
+
+.. toctree::
+    :maxdepth: 2
+
+    dataframe

docs/reference/index.rst

@@ -11,3 +11,4 @@ packages.
     bigframes.pandas/index
     bigframes.ml/index
     bigframes.bigquery/index
+    bigframes.streaming/index

docs/templates/toc.yml

@@ -203,4 +203,9 @@
     - name: BigQuery built-in functions
       uid: bigframes.bigquery
     name: bigframes.bigquery
+  - items:
+    - name: Overview
+      uid: bigframes.streaming
+    name: Streaming
+    status: beta
   name: BigQuery DataFrames