Update documentation

README.md

@@ -117,8 +117,22 @@ ADC Channel 3: value: 78
 root@colibri-vf:~# ./pwm 
 Enter PWM chip number:  0
 Enter PWM number:       0
-Enter PWM Period:       1000000
-Enter PWM Duty Cycle:   500000
-PWM will be running for 10 seconds
 Disabling PWM
 ```
+
+###### alsa-audio
+```
+root@colibri-vf:~# ./alsa-audio Front_Center.wav colibri-vf
+Module Name: colibri-vf
+short read: read 1774 bytes
+end of file on input
+```
+
+###### gtk & gtkmm
+gtk and gtkmm examples requires a display to be connected.
+
+###### cairo
+cairo requires a display to be connected.
+```
+root@colibri-vf:~# ./cairo example.png
+```