Could you add description HOW TO run the code on your readme?

[YoshiRi]

Hi. Thanks for your nice hand-tracking code.

I think it's better to add following sentences to your README so that the beginners can try your code easily.

## How to run the code
Go to the Finger Detection and Tracking directory.
Then, 

1. Run the code with command `python FingerDetection.py`
2. Put your parm over the green squares
3. Then, press `z` key to start tracking
4. Finish program with `Esc` key.

Regards

[amarlearning]

@YoshiRi create a pull request, I will merge it asap!

[amarlearning]

Fixed 😄