Create README.md

Author: petcupaula

README.md

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+# Servo calibration using Arduino
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+Tool to determine min and max pulse widths to use for a servo
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+<img src="screenshot.png" width="400">
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+Wiring diagram:
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+<img src="servo_calibration_bb.png" width="800">
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+Other tutorials:
+* Servos might be different from each other, even if it is the same model (see tests here: https://www.hackster.io/jeremy-lindsay/how-accurate-are-my-servos-21f703 and https://www.hackster.io/jeremy-lindsay/calibrating-my-servos-fa27ce)
+* If it exceedes a range it drains a lot of power and then gets stuck (like here: https://www.instructables.com/id/Calibrating-Servos-for-Bracketrobot-Arm/)
+* Calibration videos: https://www.youtube.com/watch?v=cvqAoBrLs7M and https://www.youtube.com/watch?v=C4amAdbH60w
+