Initialize repo, add README

README

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+Display Rotation Tool
+===
+
+A very simple C program, that just rotates the X11 screen 90 degrees
+counter-clockwise.
+
+The main use case is to hook it up on a button to rotate my T101MT in tablet
+mode without having to reach the keyboard.
+
+### Do I know, what I am doing?
+
+No, but I can easily know if it works. Also, a tutorial
+(https://tronche.com/gui/x/xlib-tutorial/2nd-program-anatomy.html) and
+Xrandr(3) man page probably know :-)