Merge pull request #2 from aliphys/aliphys/addReadme

[TC-335] Add readme

Author: facchinm

README.md

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+Library to handle the PMIC (Power Management IC) on the following Arduino boards
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+- [Arduino Portenta H7](https://docs.arduino.cc/hardware/portenta-h7)
+- [Arduino Portenta H7 Lite](https://docs.arduino.cc/hardware/portenta-h7-lite)
+- [Arduino Portenta H7 Lite Connected](https://docs.arduino.cc/hardware/portenta-h7-lite-connected)
+- [Arduino Nicla Vision](https://docs.arduino.cc/hardware/nicla-vision)