feat: add basic readme

README.md

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+# State webhook
+
+Custom Home Assistant integration which allows you to sent state changes of entities to a webhook
+
+## Usage
+
+For each webhook you'd like to add go to "Devices & services", and click "Add integration", search for `State webhook` and follow the instructions.
+Or click the button below.
+
+[![Open your Home Assistant instance and start setting up a new integration.](https://my.home-assistant.io/badges/config_flow_start.svg)](https://my.home-assistant.io/redirect/config_flow_start/?domain=state_webhook)