Update README.md

Author: nalquas

README.md

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-# mainfighter
-A shoot-em-up for TIC-80
+# MainFighter
+MainFighter is a shoot-em-up with pseudo-3d graphics, made for the [TIC-80 fantasy console](https://tic80.com/). It was originally made during the [#FC_JAM 2](https://itch.io/jam/fantasy-console-game-jam-2) in 2017.
+
+![Gameplay Demonstration](media/gameplay.gif)
+
+## Getting the game
+You have the following options:
+
+- Get it from [itch.io](https://nalquas.itch.io/mainfighter)
+- Get it from [tic80.com](https://tic80.com/play?cart=287)
+- Get it from [GitHub](https://github.com/nalquas/mainfighter/releases)
+
+## How to play
+In MainFighter, you play a fighter in a planet's atmosphere. Your goal is to defeat all enemy spacecraft to win that bet you made with *Droid X2* yesterday.
+
+## Controls
+- Movement: directional keys (normally arrow keys)
+- Shoot: TIC-80's "A" button (normally Z on your keyboard)
+
+## How to use development version
+If you **don't** have TIC-80 Pro, please download the `.tic` cartridge in the GitHub release tab instead. The normal TIC-80 build can't open `.lua` formatted development cartridges. Alternatively, you should also be able to use a self-compiled version of TIC-80.
+
+Assuming you have TIC-80 Pro installed, you can install the `.lua` dev cartridge like this:
+
+- Run TIC-80 Pro
+- Type `folder` to open your TIC-80 directory
+- Copy `mainfighter.lua` into the folder
+- Type `load mainfighter.lua`, then `run`