Added LICENSE.md and README.md

LICENSE.md

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+MIT License
+
+Copyright (c) 2017 Bertrand Lemasle
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# High autonomy GPS tracker.
+
+A custom Arduino 2 layers board meant to be use with a dedicated [firmware](https://github.com/blemasle/arduino-gpstracker). The result is a high autonomy GPS tracker that can be use to track moving vehicules.
+
+See the [firmware repository](https://github.com/blemasle/arduino-gpstracker) for more info.
+
+## Hardware
+This project has been build on a [ATMega328p](https://www.microchip.com/wwwproducts/en/ATMEGA328P) for its ease of use, low power consumption and wide support.
+
+On top of that, several ICs are needed :
+* [SIM808](https://simcom.ee/documents/?dir=SIM808) : GPRS & GPS.
+* [DS3231](https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS3231.html) : Real Time Clock, used for time keeping and battery saving.
+* [24LCxxx](https://www.microchip.com/wwwproducts/en/en010828) : EEPROM used to buffer raw data before sending.
+
+## Soldering
+Solering this circuit board requires either the use of soldering paste or fine soldering skills. 
+The SIM808 IC can indeed be quite hard to solder by hand because of its form factor that requires you to solder each one of its 64 pins separately instead of the usual flux and drag technique.   Moreover, the shape of each pin make it very easy to solder several pins together or soldered with not enough tin to make a reliable connection.