Added README.md

README.md

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+# A genetic algorithm example using cars and Unity
+
+# Downloads
+You can find the pre-built binaries for Windows, Linux and MacOSX [here](https://github.com/doriandu45/CarAI/releases)
+
+# How to use?
+Simply run the executable. At the beginning, you can change the following settings:
+  - Cars per batch: How many cars spawn each time. Setting it too high (100-200 or more) may cause lag depending of your computer
+  - Batches: how many batches of n cars per generation. After all the batches are done, the next generation is generated and start automatically
+  - Checkpoint cooldown: The time cars have to reach a checkpoint. If they don't reach it in time, they die
+  - Cooldown scaling: Each generation, the cooldown gets multiplied by this value. The goal is to reduce progressiveley the cooldown. You can set it to 1 if you don't want the cooldown to change, or even higher if you want the cooldown to increase
+  - Minimum cooldown: the cooldown won't get lower than this value
+  - Mutation rate: it represent "1 chance out of x" for a mutation to occur. Setting it high is recommended.
+
+# What is it?
+At the beginning, it's a little personnal project, and also the first time I used Unity ever. It was made for a quick demo during a presentation in my English class about AI.
+WARNING: The code may not be great, but it works. Also, the comments are in French
+