There are some research papers on the topic:
- Efficient Reinforcement Learning Through Evolving Neural Network Topologies (2002)
- Reinforcement Learning Using Neural Networks, with Applications to Motor Control
- Reinforcement Learning Neural Network To The Problem Of Autonomous Mobile Robot Obstacle Avoidance
And some code:
- Code examples for neural network reinforcement learning.
Those are just some of the top google search results on the topic. The first couple of papers look like they’re pretty good, although I haven’t read them personally. I think you’ll find even more information on neural networks with reinforcement learning if you do a quick search on Google Scholar.