Update README.md

README.md

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 # velociraptor-docker
-Docker image for Velocidex Velociraptor
+Run [Velocidex Velociraptor](https://github.com/Velocidex/velociraptor) server with Docker
+
+#### Install
+
+- Ensure [docker-compose](https://docs.docker.com/compose/install/) is installed on the host
+- `git clone https://github.com/weslambert/velociraptor-docker`
+- `cd velociraptor-docker`
+- `docker-compose up`
+- Access the Velociraptor GUI via https://\<hostip\>:8889 
+  - Default u/p is `admin/admin`
+  - This can be changed by running: `docker exec -it velox ./velociraptor --config server.config.yaml user add user1 user1 --role administrator`
+
+#### Notes:
+
+Linux, Mac, and Windows binaries are located in `/velociraptor/clients`, which should be mapped to the host in the `./velociraptor` directory if using `docker-compose`
+
+Once started, edit `server.config.yaml` in `/velociraptor`, then run `docker-compose down/up` for the server to reflect the changes
+
+#### Docker image
+To pull only the Docker image:
+
+`docker pull wlambert/velociraptor`