Add initial sphinx docs (#120)

docs/README.md

@@ -0,0 +1,20 @@
+# CacheFlow documents
+
+## Build the docs
+
+```bash
+# Install dependencies.
+pip -r requirements-docs.txt
+
+# Build the docs.
+make clean
+make html
+```
+
+## Open the docs with your brower
+
+```bash
+cd build/html
+python -m http.server
+```
+Launch your browser and open localhost:8000.