Update README.md

README.md

@@ -9,3 +9,5 @@ It's meant to run on a [PewPew v10.2](https://pewpew.readthedocs.io/en/latest/pe
 It was conceived at the University of Birmingham's CSS / Qiskit Hackathon on Saturday, November 16th. That version along with a fleshed-out, explanatory README of the coding process are viewable in the `qiskit_hackathon` folder.
 
 The version presented at the root of this repo is the leaner version made a month later, which most notably implements the quantum tunnelling gameplay feature in a less erroneous and physically more consistent manner, made possible thanks to the excellent Wikipedia page on [rectangular potential barriers](https://en.wikipedia.org/wiki/Rectangular_potential_barrier) and the help of a Qiskit advocate at the hackathon.
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+The game is immediately ran by inserting the line `import acid_rain` into your `main.py` file.