squash! examples : add README.md to tts example [no ci]

Fix heading to be consistent with other examples, and add a quickstart
section to README.md.

Author: danbev

examples/tts/README.md

@@ -1,8 +1,17 @@
-## Text To Speach (TTS) example
+# llama.cpp/example/tts
 This example demonstrates the Text To Speach feature. It uses a
 [model](https://www.outeai.com/blog/outetts-0.2-500m) from
 [outeai](https://www.outeai.com/).
 
+## Quickstart
+If you have built llama.cpp with `-DLLAMA_CURL=ON` you can simply run the
+following command and the required models will be downloaded automatically:
+```console
+$ build/bin/llama-tts --tts-oute-default -p "Hello world" && aplay output.wav
+```
+For details about the models and how to convert them to the required format
+see the following sections.
+
 ### Model conversion
 Checkout or download the model that contains the LLM model:
 ```console