Added new SNN library

I've added a new library for efficiently training spiking neural networks in JAX for deployment to neuromorphic hardware.

readme.md

@@ -107,6 +107,7 @@ This section contains libraries that are well-made and useful, but have not nece
 - [purejaxrl](https://github.com/luchris429/purejaxrl) - Vectorisable, end-to-end RL algorithms in JAX. <img src="https://img.shields.io/github/stars/luchris429/purejaxrl?style=social" align="center">
 - [Lorax](https://github.com/davisyoshida/lorax) - Automatically apply LoRA to JAX models (Flax, Haiku, etc.)
 - [SCICO](https://github.com/lanl/scico) - Scientific computational imaging in JAX. <img src="https://img.shields.io/github/stars/lanl/scico?style=social" align="center">
+- [Spyx](https://github.com/kmheckel/spyx) - Spiking Neural Networks in JAX for machine learning on neuromorphic hardware. <img src="https://img.shields.io/github/stars/kmheckel/spyx?style=social" align="center">
 - [BrainPy](https://github.com/brainpy/BrainPy) - Brain Dynamics Programming in Python. <img src="https://img.shields.io/github/stars/brainpy/BrainPy?style=social" align="center">
 - [OTT-JAX](https://github.com/ott-jax/ott) - Optimal transport tools in JAX. <img src="https://img.shields.io/github/stars/ott-jax/ott?style=social" align="center">
 - [QDax](https://github.com/adaptive-intelligent-robotics/QDax) - Quality Diversity optimization in Jax. <img src="https://img.shields.io/github/stars/adaptive-intelligent-robotics/QDax?style=social" align="center">