Added usage information to README.md

README.md

@@ -1,5 +1,24 @@
-# minceraft
+# Minceraft
 
 A Minecraft clone written in C++11.
 
-![Alt text](https://github.com/CobaltXII/minceraft/blob/master/img/screenshot_1.png?raw=true)
+![Alt text](https://github.com/CobaltXII/minceraft/blob/master/img/screenshot_1.png?raw=true)
+
+# Usage
+
+```
+Usage: ./minceraft ...
+
+    -s <path-to-level> [x_res y_res z_res]
+
+        Play singleplayer. If a world save exists at <path-to-level>, the.      
+        world is loaded and the given dimensions (if any) are ignored. If not,  
+        a new world is generated with the given dimensions and saved to         
+        <path-to-level>.                                                        
+
+    -q [x_res y_res z_res]
+
+        Play quickplay. A new world is generated with the given dimensions (if. 
+        any) and is stored in memory for the duration of the gameplay.          
+```
+