added git lfs to README

Author: xianshijing-lk

README.md

@@ -9,6 +9,9 @@ This SDK enables native C++ applications to connect to LiveKit servers for real-
 - **Rust / Cargo** (latest stable toolchain)  
 - **Protobuf** compiler (`protoc`)  
 - **macOS** users: System frameworks (CoreAudio, AudioToolbox, etc.) are automatically linked via CMake.
+- **Git LFS** (required for examples)
+  Some example data files (e.g., audio assets) are stored using Git LFS.
+  You must install Git LFS before cloning or pulling the repo if you want to run the examples.
 
 
 ## 🧩 Clone the Repository
@@ -51,7 +54,6 @@ export LIVEKIT_TOKEN=<jwt-token>
 
 Press Ctrl-C to exit the example.
 
-
 ##  🧰 Recommended Setup
 ### macOS
 ```bash

examples/simple_room/wav_audio_source.cpp

@@ -26,7 +26,9 @@
 WavData load_wav16(const std::string &path) {
   std::ifstream file(path, std::ios::binary);
   if (!file) {
-    throw std::runtime_error("Failed to open WAV file: " + path);
+    throw std::runtime_error("Failed to open WAV file: " + path +
+                             " (If this file exists in the repo, ensure Git "
+                             "LFS is installed and run `git lfs pull`)");
   }
 
   auto read_u32 = [&](uint32_t &out_value) {