Add condition selector for blueprint (#28184)

source/_docs/blueprint/selectors.markdown

@@ -24,6 +24,7 @@ The following selectors are currently available:
 - [Backup location selector](#backup-location-selector)
 - [Boolean selector](#boolean-selector)
 - [Color temperature selector](#color-temperature-selector)
+- [Condition selector](#condition-selector)
 - [Config entry selector](#config-entry-selector)
 - [Constant selector](#constant-selector)
 - [Conversation agent selector](#conversation-agent-selector)
@@ -327,6 +328,29 @@ max_mireds:
 
 The output of this selector is the number of mired selected, for example, `243`.
 
+## Condition selector
+
+The condition selector allows the user to input one or more conditions.
+On the user interface, the condition part of the automation editor will be shown.
+The value of the input will contain a list of conditions.
+
+![Screenshot of an condition selector](/images/blueprints/selector-condition.png)
+
+This selector does not have any other options; therefore, it only has its key.
+
+```yaml
+condition:
+```
+
+The output of this selector is a list of conditions. For example:
+
+```yaml
+# Example Condition selector output result
+- condition: numeric_state
+  entity_id: "sensor.outside_temperature"
+  below: 20
+```
+
 ## Config entry selector
 
 The config entry selector allows the user to select an integration