Add text platform docs (#24989)

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

source/_integrations/text.markdown

@@ -0,0 +1,32 @@
+---
+title: Text
+description: Instructions on how to set up text entities within Home Assistant.
+ha_category:
+  - Text
+ha_release: '2022.12'
+ha_domain: text
+ha_quality_scale: internal
+ha_codeowners:
+  - '@home-assistant/core'
+  - '@raman325'
+ha_integration_type: entity
+---
+
+The Text integration is built for the controlling and monitoring of text values on devices.
+
+Text entities cannot be implemented manually, but can be provided by other integrations. If you are looking for a way to create a text entity, please take a look at the [Text helper](/integrations/input_text).
+
+## Services
+
+### text services
+
+Available services: `text.set_value`
+
+### Service `text.set_value`
+
+Set the textual value of the text entity.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id` | no | String or list of strings that point at `entity_id`'s of texts to control.
+| `value` | no | The new text value to set.