Create README.md

README file for the files for Adafruit tutorial "IR Sensor"

Author: TheKitty

IR_Sensor/README.md

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+## Code for the Adafruit Tutorial IR Sensor
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+Adafruit Learning System: [IR Sensor](https://learn.adafruit.com/ir-sensor)
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+Code for Arduino and for CircuitPython
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+All code MIT License, please keep attribution
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+Please consider buying your parts at [Adafruit.com](https://www.adafruit.com) to support open source code
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+For proposed changes, please submit a Pull Request with potential fixes