Add tasmota documentation (#14956)

Co-authored-by: Franck Nijhof <git@frenck.dev>

source/_integrations/tasmota.markdown

@@ -0,0 +1,43 @@
+---
+title: Tasmota (beta)
+description: Instructions on how to integrate Tasmota with Home Assistant.
+ha_category:
+  - Binary Sensor
+  - Light
+  - Sensor
+  - Switch
+ha_release: '0.117'
+ha_iot_class: Local Push
+ha_config_flow: true
+ha_codeowners:
+  - '@emontnemery'
+ha_domain: tasmota
+---
+
+This integration allows you to control Tasmota devices over MQTT.
+
+## Requirements
+
+- MQTT server and the [MQTT integration](/integrations/mqtt/) set up in Home Assistant.
+- Tasmota devices flashed with 9.0.0.1 or later
+- Tasmota devices configured for native discovery (`SetOption19 0`)
+
+## Limitations
+
+Lights, relays, sensors and switches are supported.
+
+- Lights will be added as Home Assistant `light` entities.
+- Relays will be added as Home Assistant `switch` entities, if `SetOption30 = 1`. If `SetOption30 = 0`, relays will be added as `light` entities.
+- Sensors will be added as Home Assistant `sensor` entities.
+- Switches will be added as Home Assistant `binary_sensor` entities, if a `switchtopic` is set or there is no corresponding power device (light, relay, etc.).
+
+## Configuration
+
+This integration can be configured using the integrations in the
+Home Assistant frontend.
+
+Menu: **Configuration** -> **Integrations**.
+
+Click on the `+` sign to add an integration and click on **Tasmota (beta)**.
+After completing the configuration flow, the Tasmota integration will be
+available.