Add a NOTES.txt file

For now add a reference about the control API, the pwc driver also uses
an input device and some controls for tilt/pan.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>

diff --git a/NOTES.txt b/NOTES.txt
new file mode 100644 (file)
index 0000000..732cece
--- /dev/null
+++ b/NOTES.txt
@@ -0,0 +1,2 @@
+Control tilt, led, get accelerometer status
+http://lxr.linux.no/#linux+v2.6.36/drivers/media/video/pwc/pwc.h#L250