Added readme

Fix #1

Author: cmaglie

README.md

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+Package `properties` is a library for handling maps of hierarchical properties.  
+
+This library is mainly used in the Arduino platform software to handle
+configurations made of key/value pairs stored in files with an INI like
+syntax.
+
+For more information read the docs [here](https://godoc.org/github.com/arduino/go-properties-map).
+