adding readme

Author: angeris

README.md

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+# CFMM Optimal Routing
+This repository contains the code needed to generate the figures used in the paper
+[Optimal Routing for Constant Function Market Makers](https://stanford.edu/~guillean/papers/cfmm-routing.pdf).
+
+## Requirements
+The requirements for running these examples are:
+- `NumPy`
+- `Matplotlib`
+- `Cvxpy` (see [here](https://www.cvxpy.org/install/index.html) for installation)
+
+In order to generate the figures as done in the paper you will also need a working TeX distribution.
+
+## How to run
+All examples are self-contained and can be run directly, e.g.:
+```bash
+python arbitrage.py
+```
+The figures were generated by running
+```bash
+python two-asset.py
+```
+but note that this requires a working TeX distribution. (This can be avoided by commenting out any call to `latexify` in `two-asset.py` which requires `ps` as a backend for plotting.)