Added instructions to README on how to run this inside Docker.

README.md

@@ -19,7 +19,10 @@ The _old school_ way of installing Searxbot is quite simple:
 
 ### Docker
 
-Dockerfile coming soon™
+1.  `git clone` this repository somewhere on your server.
+2.  Rename the `auth.json.example` file to `auth.json` and fill in your credidentials.
+3.  Build the Docker image like this: `docker build -t fuerbringer/searxbot .`
+4.  Run the Docker image: `docker run -d --name searxbot fuerbringer/searxbot`
 
 ## SearX instances
 A list of public SearX instances can be found [here](https://github.com/asciimoo/searx/wiki/Searx-instances).