Sync from upstream llama.cpp repository

examples/simple-chat/README.md

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+# llama.cpp/example/simple-chat
+
+The purpose of this example is to demonstrate a minimal usage of llama.cpp to create a simple chat program using the chat template from the GGUF file.
+
+```bash
+./llama-simple-chat -m Meta-Llama-3.1-8B-Instruct.gguf -c 2048
+...