Added README.md file (#18)

* Added README.md file

* Update README.md

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

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

Author: Engineer1999

README.md

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+# MKRMotorCarrier library
+
+
+This library is designed to use the MKR Motor carrier. The shield supports micro servo motors, dc motors and dc motors with encoder. This library, therefore, has functions and creates objects to support such hardware. Objects are automatically created when "ArduinoMotorCarrier.h" is included, hence no need to initiate objects manually.
+
+For more information about this library please visit us at
+
+<https://www.arduino.cc/en/Reference/MKRMotorCarrier>
+# 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