Update 'README.md'

README.md

@@ -1,3 +1,15 @@
 # XCB-Xinput-test
 
-Little test that I made to figure out how use the Xinput extension of X11 with XCB.
+Little test that I made to figure out how use the Xinput extension of X11 with XCB.
+It creates a white window to receive touch events. With a touchscreen, tap on that window. Works with multiple simultaneous touches. However it is an early experiment and therefore this program only detect the touches, and does nothing more. The number appearing in stdout are the each's touch identifier.
+
+To compile, just run
+`make`
+
+Dependencies :
+* C99 + posix
+* libxcb
+* libxcb-xinput
+
+Controls:
+* just screen touches