Instructions for runnning

README.md

@@ -31,4 +31,12 @@ simulations on parallel compute hardware (mainly GPUs).
 You can install the requirements and their dependencies easily with
 ```bash
 pip intall -r requirements.txt
+```
+
+## Running
+The root directory contains ``fdtd.py``, which sets up and runs a sample simulation
+ (cavity ringdown).
+
+```bash
+python3 fdtd.py
 ```