Added logo (#167)

Author: pauladkisson

README.md

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 [![DOI](https://zenodo.org/badge/382176345.svg)](https://zenodo.org/badge/latestdoi/382176345) [![Join the chat at https://gitter.im/LernerLab/GuPPy](https://badges.gitter.im/LernerLab/GuPPy.svg)](https://gitter.im/LernerLab/GuPPy?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-# GuPPy
- Guided Photometry Analysis in Python, a free and open-source fiber photometry data analysis tool.
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+<img src="assets/GuppyLogo.png" alt="GuPPy Logo" width="300">
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 ## Installation Instructions