add doc config files and doc [Dinitial draft

Signed-off-by: weichen <niweichen@chinamobile.com>
Change-Id: Ibd08a2d4b77cd4fc9ea0114bf78072711ea03e78
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 0000000..3797dc8
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,20 @@
+---
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+# Required
+version: 2
+
+formats:
+  - htmlzip
+
+build:
+  image: latest
+
+python:
+  version: 3.7
+  install:
+    - requirements: docs/requirements-docs.txt
+
+sphinx:
+  configuration: docs/conf.py