llama : add simple-chat example (#10124)

* llama : add simple-chat example

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Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>

examples/CMakeLists.txt

@@ -49,6 +49,7 @@ else()
     endif()
     add_subdirectory(save-load-state)
     add_subdirectory(simple)
+    add_subdirectory(simple-chat)
     add_subdirectory(speculative)
     add_subdirectory(tokenize)
 endif()