Rename readme to markdown.

Readme.md

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+#DOOM TOURNAMENT
+
+What began as a test for importing UT vertex meshes has turned into an actual
+full UT weapon and item mod.
+
+### Important
+
+#### Currently you have to patch in
+[this pull request](https://github.com/coelckers/gzdoom/pull/495) yourself for
+models to render correctly.
+
+Currently implemented:
+
+ - Flak Cannon (slot 8)
+ - ASMD Shock Rifle (slot 4)
+ - Redeemer (slot 0)
+ - GES Biorifle (slot 3)
+ - Pulsegun (slot 5) (with beta animations)
+ - Health
+  - Big Keg O' Health (soulsphere)
+  - Beta Super Health (medkit)
+  - Health Pack (stimpak)
+  - Health Vial (health bonus)
+ - Some configuration options
+ - Damage Amplifier (berserk)
+ - Keys
+ - Backpack
+ - Armor
+  - Armor Bonus (armor bonus)
+  - Thigh Pads (green armor)
+  - Body Armor (blue armor)
+  - Shield Belt (megasphere)
+ - Invisibility (blursphere)
+ - Computer Map (computer area map)
+ - Searchlight (light amplification visor)
+ - Enhanced Shock Rifle (slot 4, limited ammo, invulnerability sphere)
+ - UT HUD
+ - Impact Hammer (slot 1)
+ - Chainsaw (slot 1)
+ - Translocator (slot 1)
+ - Enforcer (slot 2)
+   - Dual Enforcers (slot 2)
+ - Ripper (slot 6)
+ - Jump Boots (radsuit, has "iron boots" powerup effect to compensate)
+ - Minigun (slot 7)
+ - Sniper Rifle (slot 0)
+ - Rocket Launcher (slot 9)
+ - Scaling/Customization options for the HUD
+
+In progress:
+
+ - Make biorifle sludge follow ceiling and wall movement (this might be hard)
+ - Add some more effects, maybe some nicer recoil on guns too
+ - General polishing and bugfixing
+ - Trim out unused animations
+
+Known bugs:
+
+ - Sometimes the slave enforcer has its psprite "lower" slightly while the main
+   enforcer is reloading. No idea what causes this (Could be bobbing-related)
+ - Sludge doesn't react to ceiling and wall movement
+ - Pulse gun beams behave oddly when the player is on moving platforms.
+   This might just be a rendering interpolation glitch, as usual