misc: added README to docker directory

docker/README.md

@@ -0,0 +1,19 @@
+# Dockerfile for running Schism
+
+To aid the reproducibility of work carried out with Schism, alongside its wider usage, this directory contains a Dockerfile which can be used to run the code. With this, both tests and examples can be run.
+
+# Building and running the image
+
+To build the image, one must navigate to the main directory (that above this one) and run the following command:
+
+`docker build --network=host --file docker/dockerfile --tag schism .`.
+
+To run a bash shell inside the image, use:
+
+`docker run -i -t schism /bin/bash`.
+
+Note that these commands may require `sudo`. Once inside the image, one will want to activate the `venv` created, using:
+
+`source venv/bin/activate`.
+
+From here, one can run the tests and examples, found in `app/schism`.