add instructions for building the paper

README.md

@@ -3,3 +3,18 @@
 This is the companion paper to the [adaptive](https://adaptive.readthedocs.io/en/latest/) Python library.
 
 See the latest draft [here](https://gitlab.kwant-project.org/qt/adaptive-paper/builds/artifacts/master/file/paper.pdf?job=make).
+
+### Building the paper
+
+The simplest way to build the paper is with Docker, to make sure that all the necessary dependencies are installed.
+First build the Docker image:
+
+```
+docker build -t adaptive-paper .
+```
+
+Then run `make` inside a docker container using the image you just built:
+
+```
+docker run -it --rm -v $(pwd):/work -w /work adaptive-paper make
+```