added commandline/in-game key documentation as requested by jason.

This was SVN commit r572.

binaries/system/instructions.txt

@@ -0,0 +1,32 @@
+____________
+
+Command line
+____________
+
+(note exact spelling of the actual switches, e.g. -nopbuffer, not -NOPBUFFER)
+
+-m=MAP		load the file <MAP> (string) instead of the default test01.pmp
+-g=F		set the gamma correction to <F> (floating point; 0.0 < F <= 1.0)
+-e		show entity graph
+-v		enable VSync, i.e. lock FPS to monitor refresh rate
+-novbo		disable Vertex Buffer Objects; may solve graphics-related problems on older/buggy graphics cards
+-nopbuffer	disable Pixel Buffers;         may solve graphics-related problems on older/buggy graphics cards
+-f		enable fixed frame timing; ?
+-s		enable shadows
+-xres=N		set desired screen X resolution to <N> (integer)
+-yres=N		set desired screen Y resolution to <N> (integer)
+-conf=NAME=VAL	set config variable <NAME> (string) to <VAL> (string)
+
+____________
+
+In-game
+____________
+
+(LMB, MMB, RMB = left, middle, right mouse buttons)
+
+(ctrl+RMB) OR (LMB+RMB)		rotate view when mouse is moved
+arrow keys, mouse on map edge	scroll on the map
+MMB				scroll when mouse is moved (as with normal map scrolling)
+mouse wheel			zoom in/out
+Escape				exit
+