add docker-compose instructions (#898)

docker/README.md

@@ -1,2 +1,14 @@
 ## How-to
-For instructions on how to use the docker-related files in this folder check out [this post](https://francescopochetti.com/developing-inside-a-docker-container-in-visual-studio-code/).
+
+To build the icevision image, run the following command:
+```
+docker-compose build
+```
+
+Once the icevision image has been successfully built, run the icevision service:
+```
+ docker-compose run --rm -d icevision
+```
+
+**Note**
+For more detailed instructions on how to use this icevision docker container as well how connect it to Visual Studio Code, check out this in-depth [blog post](https://francescopochetti.com/developing-inside-a-docker-container-in-visual-studio-code/).