Added basic readme

readme.md

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+pipersense
+==========
+
+[![Build Status](https://travis-ci.org/danimtb/pipersense.svg?branch=master)](https://travis-ci.org/danimtb/pipersense)
+
+This is a firmware designed for multisensor devices based on nodemcu V2 board communitacting over Wifi and MQTT communication protocol. The main purpose of this firmware is to perform as best with [Home Assistant](home-assistant.io).
+
+It is designed with these features in mind:
+- Simple low coupled clases with all functionality ([esp8266-utils](https://github.com/danimtb/esp8266-utils) -Relay, LED, Button, WifiManager, MqttManager, DataManager (EEPROM)...).
+- Easy to use and reusable to create firmware for other devices.
+- C++ code and Arduino interface approach (``setup()``, ``loop()``).
+
+It's capabilities are:
+- Fast connection to Wifi network and MQTT broker.
+- Publish device information and state topics to MQTT at connection start and periodically.
+- ArduinoOTA to target devices flashing a new firmware over Wifi.
+- Automatic Updates from devices calling an Update Server with new releases.
+
+Supported devices
+-----------------
+
+### Nodemcu V2
+
+![nodemcuv2](images/pipersense-wiring.png)