Update 'README.md'

README.md

@@ -1,3 +1,20 @@
 # XCB-Present-test-1
 
-Little test that I made to figure out how use the Present extension of X11 with XCB.
+Little test that I made to figure out how use the Present extension of X11 with XCB. It animates 2 squares moving around and show some stats. That's it. I didn't put in any code to manage its size so don't resize its window.
+
+To compile, just run make
+
+Dependencies :
+* C99 + posix
+* libxcb
+* libxcb-present
+* libxcb-util
+* libcairo
+    
+Launch args :
+-l : sets a frame divider to limit the framerate, (example l=2 -> run at 30Hz if X is running at 60Hz).
+-a : async mode, update the animation as fast as possible without waiting for vblank
+
+Controls:
+* none
+