Update README.md

Author: Jashcraf

README.md

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 # Poke: Integrating Ray and Diffraction Models
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 Poke (pronounced poh-keh) is a ray-based physical optics module for Python. It's named this because the name encodes the k-vector (which we are raytracing!) and the E-vector (which we are propagating!). Also I came up with the name before lunchtime, when I was craving fish from [Suisan](https://www.suisan.com/our-services/fish-market/).