Added README.md in ArduinoLowPower (#26)

* Added README.md in ArduinoLowPower

* Update README.md

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Co-Authored-By: per1234 <[email protected]>

* Update README.md

Co-Authored-By: per1234 <[email protected]>

Co-authored-by: per1234 <[email protected]>

Author: Engineer1999

README.md

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+# Arduino Low Power library
+
+This library allows the use of the low power features of the SAMD21 MCU. This means your battery powered projects will have a longer battery life on boards like [MKRZero](https://store.arduino.cc/usa/arduino-mkrzero), [MKR1000](https://www.arduino.cc/en/Main/ArduinoMKR1000) and [MKRFox1200](https://www.arduino.cc/en/Main/ArduinoBoardMKRFox1200).
+
+For more information about this library please visit us at
+
+<https://www.arduino.cc/en/Reference/ArduinoLowPower>
+# License
+Copyright (c) Arduino LLC. All right reserved.
+
+This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA