Add home assistant integration

[mwood77]

Following PR adds the ability to integrate Winderoo into Home Assistant via MQTT.

The following entities are available in Home Assistant

 -  button.winderoo_start
 -  button.winderoo_stop

 -  sensor.winderoo_status            : "Winding | Stopped"
 -  sensor.winderoo_wifi_reception    : "Excellent | Good | Fair | Poor"
 
 -  number.winderoo_rotations_per_day : 100 <-> 960 

 -  select.winderoo_direction         : "CCW | BOTH | CW"
 -  select.winderoo_hour              : 00 <-> 23
 -  select.winderoo_minutes           : 00 <-> 50
 
 -  switch.winderoo_timer_enabled     : "true | false"
 -  switch.winderoo_oled              : "true | false"
 -  switch.winderoo_power             : "true | false"

---

Todo:

• Add timer hours
• Add timer minutes
• Add power toggle
• Add current state entity
• Add WiFi reception entity
• documentation