Add installation instructions in the readme

[beausmith]

Home Assistant has evolved and it seems that this is not an officially supported integration and thus is not listed among the official integrations which can be added easily.

However the fact that a hacs.json file exists lead me to install HACS in order to get this support in home assistant.

I did also use the Manual Alarm Control to complete the integration.

So the process was:

1. Install Konnected.io integration, attach sensors to the boards, and configure the boards.

2. Install HACS.

3. Install noonlight-hass via HACS.

4. Add a noonlight entry to the configuration.yaml file:

   # Noonlight
   noonlight:
     id: YOUR_ID_HERE
     secret: YOUR_SECRET_HERE
     api_endpoint: https://api.noonlight.com/platform/v1
     token_endpoint: https://noonlight.konnected.io/ha/token
   

5. Install integration for the Manual Alarm Control

6. Add config for the Manual alarm control the the configuration.yaml file:

   alarm_control_panel:
     - platform: manual
   

7. Create Automation to call Noonlight if the Manual alarm is triggered:
   
   Here is the YAML version automatically created from the UI above:

   alias: Noonlight Alarm
   description: ''
   trigger:
     - platform: state
       entity_id: alarm_control_panel.ha_alarm
       to: triggered
   condition: []
   action:
     - service: homeassistant.turn_on
       target:
         entity_id: switch.noonlight_switch
   mode: single
   

   At this point you can manually trigger the automation test that the integration between the Manual alarm and Noonlight is working.

8. Create automations to trigger the manual alarm if various sensors connected to the Konnected.io board change. This step is not detailed here because it will be different based upon what sensors you have.