Function spec example for say_tts

examples/function/say_tts/README.md

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+## Objective
+
+- say_tts will say a message on any text to speech device
+
+## Function
+
+### say_tts
+```yaml
+- spec:
+    name: say_tts
+    description: Say message on a text to speech device
+    parameters:
+      type: object
+      properties:
+        message:
+          type: string
+          description: message you want to say
+        device:
+          type: string
+          description: entity_id of media_player tts device
+      required:
+      - message
+      - device
+  function:
+    type: script
+    sequence:
+    - service: tts.cloud_say
+      data:
+        entity_id: "{{device}}"
+        message: "{{message}}"
+```