Add initial read me (based on the SAMD core read me)

Author: sandeepmistry

Diff for: README.md

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+# Arduino Core for ATMEGA4809 CPU
+
+This repository contains the source code and configuration files of the Arduino Core
+for Microchip's ATMEGA4809 processor (used on the Arduino Uno WiFi Rev2 boards).
+
+## Installation on Arduino IDE
+
+This core is available as a package in the Arduino IDE cores manager.
+Just open the "Boards Manager" and install the package called:
+
+"Arduino megaAVR Boards"
+
+## Support
+
+There is a dedicated section of the Arduino Forum for general discussion and project assistance:
+
+http://forum.arduino.cc/index.php?board=126.0
+
+## Bugs or Issues
+
+If you find a bug you can submit an issue here on github:
+
+https://github.com/arduino/ArduinoCore-megaavr/issues
+
+Before posting a new issue, please check if the same problem has been already reported by someone else
+to avoid duplicates.
+
+## Contributions
+
+Contributions are always welcome. The preferred way to receive code cotribution is by submitting a 
+Pull Request on github.
+
+## Developing
+
+1. Create an `<SKETCHBOOK>/hardware/arduino` folder. Where `<SKETCHBOOK>` is the location of your
+  Arduino sketchbook.
+1. Change directories: `cd <SKETCHBOOK>/hardware/arduino`
+1. Clone this repo: `git clone https://github.com/arduino/ArduinoCore-megaavr.git megaavr`
+1. Change directories: `cd megaavr/cores/arduino`
+1. Copy or symlink the `api` folder from the [ArduinoCore-API](https://github.com/arduino/ArduinoCore-API) repo.
+1. Restart the IDE
+
+## License and credits
+
+This core has been developed by Arduino SA in collaboration with Microchip.
+
+```
+  Copyright (c) 2018 Arduino SA.  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
+```