Update README.md

Author: codenamecpp

README.md

@@ -25,6 +25,17 @@ Run these commands in terminal:
 * cd GLKeeper
 * make
 
+### How to Run
+
+Original Dungeon Keeper 2 game resources required in order to play (GOG or Retail version). It still can be purchased here https://www.gog.com/game/dungeon_keeper_2
+
+Note that GLKeeper must be compiled and configured (optionally) before this step as described above.
+To run it on Linux just type in console:
+* cd GLKeeper
+* run ARGS="-gamedir XXX -mapname YYY"
+
+Here XXX is path to original game resources directory and YYY is map name to load.
+
 ### Screenshots
 
 Windows 7 x64: