updated README.md, Main.py executable bit (langton)

langton/README.md

@@ -1,9 +1,26 @@
 # Langton's Ant Simulator
 
-for help, run:
-
 ```
-python3 Main.py --help
+usage: Main.py [-h] [--steps STEPS] [--w W] [--h H] [--calc CALC]
+               [--default DEFAULT] [--fullscreen] [--window_w WIN_W]
+               [--window_h WIN_H] [--configurator] [--code CODE]
+
+langton's ant
+
+optional arguments:
+  -h, --help         show this help message and exit
+  --steps STEPS      steps per second
+  --w W              field width
+  --h H              field height
+  --calc CALC        calculate steps and only display result
+  --default DEFAULT  setting all fields to this value
+  --fullscreen
+  --window_w WIN_W   window width
+  --window_h WIN_H   window height
+  --configurator     start in field edit mode
+  --code CODE        binary code for the ant ('01' corresponds to the
+                     starndard ant behaviour)
+
 ```
 
 configuration mode keys: