updating readme with instructions

README.md

@@ -7,6 +7,34 @@ CartoDB Spatial Analysis extension for PostgreSQL.
 * *pg* contains the PostgreSQL extension source code
 * *python* Python module
 
+## Running with Docker
+
+Crankshaft comes with a Dockerfile to build and run a sandboxed machine for testing
+and development.
+
+First you have to build the docker container
+
+    docker build -t crankshaft .
+
+To run the pg tests run
+
+    docker run -it --rm -v $(pwd):/crankshaft  crankshaft /root/run_tests.sh
+
+if there are failures it will dump the reasion to the screen.
+
+To run a server you can develop on run
+
+    docker run -it --rm -v $(pwd):/crankshaft -p $(docker-machine ip default):5432:5432 /root/run_server.sh
+
+and connect from you host using
+
+    psql -U pggis -h $(docker-machine ip default) -p 5432 -W
+
+the password is pggis
+
+
+
+
 ## Requirements
 
 * pip