Added README and img/.

Author: sdl1

README.md

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+# robots
+
+AI-controlled teams of robots battle it out on a 2D battlefield. 
+
+<img src="img/robots.png" alt="robots" width="200"/>
+
+## Overview
+
+**robots** is a real-time 2D game where teams of robots compete to destroy each other.
+Robots are controlled by AIs running over network connections.
+Players compete by writing an AI to control robots.
+
+## The robots
+
+Each robot is identical and is fitted with two weapons:
+
+* **laser**: this has unlimited ammunition, but has a limited range and will overheat if overused (requiring a cool-down period). Lasers do a small amount of damage.
+* **missile**: this can be fired only once. It has unlimtied range and will travel indefinitely until it hits a robot. A missile hit will destroy a robot.
+
+Robots act independently, but may communicate to nearby robots through a system of coloured signals.
+
+## Usage
+
+Start a game world server:
+```shell
+./main.py
+```
+
+Start a single robot running AI/ExampleAI, joining team 3, on a server running at localhost port 12345:
+```shell
+./Client.py --ai=ExampleAI --team=3 --server=localhost:12345
+```
+
+Once robots successfully connect to the game world they immediately start to act autonomously according to their AI.
+
+## Writing an AI
+
+TODO
+
+## Known issues
+
+* Very messy graphics code.
+* Game world server/port currently cannot be specified.
+* Laser cooldown is wrong.
+