Update README.md

Sadaival · Feb 11, 2018 · f9d5952 · f9d5952
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-# Hand-Gestures
+# Hand-Gestures
+
+Adjusting the brightness of screen varies result. 
+try to position hand completely in the box and avoid arm or wrist coming in the box(as it will change the arearatio). 
+done using range values so may work for different color ranges for different people.