Update the readme

Author: kigiri

README.md

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+# Tron
+AI controlled Tron / Snake like game
+
+### How to play
+- Localy
+```sh
+git clone https://github.com/nan-academy/tron.git
+cd tron
+
+# from here you can just serv the files:
+http-server
+
+# if you don't have http-server installed:
+npm install -g http-server
+```
+
+- Online, just open [nan-academy.github.io/tron](https://nan-academy.github.io/tron?users=random,random)
+
+### Rules
+- You have to move every turn *(you can't stay still)*
+- Every time you move somewhere you leave a color trail.
+- You can only move to a blank tile
+- You can't move out of the map *(100 x 100)*
+- You can only move to your `left`, `up` or `right`.
+  *(Moving `backward` is suicide as you hit your own trail !)*
+- If you take to much CPU to decide where to go, you die
+- If two players moved to the same spot, they both die
+- **Survive as long as you can.**
+
+### End of the game
+- Once no players can make a move
+- The player with the longest trail wins
+
+### Controls
+- `space` toogle autoplay
+- `right arrow` play one move
+- `up arrow` increase autoplay speed
+- `down arrow` lower autoplay speed
+- `R` reload the same play
+- `S` load a new play (new seed)
+
+### How to write your AI
+- Copy the file [/ai/random.js](https://github.com/nan-academy/tron/blob/master/ai/random.js) to /ai/**GITHUB_LOGIN**.js
+- You may now edit the `update` function which is called each turn
+
+### Publish your AI
+- Fork this repo
+- Create file that use your github login as filename in the /ai/ folder
+- Push that to master and your are done
+