add helpful links to the readme

Author: gesellix

README.md

@@ -1 +1,5 @@
 # docker-remote-api
+
+Official documentation: https://docs.docker.com/engine/api/
+API reference (latest release): https://docs.docker.com/engine/api/latest/
+API reference source: https://github.com/moby/moby/blob/master/api/swagger.yaml