feat(wasi-threads): Add example of exception propagation (#1812)

samples/wasi-threads/README.md

@@ -1 +1,24 @@
-# "WASI threads" sample introduction
+# "WASI threads" sample introduction
+
+Currently, since the `wasi-sdk` does not have thread support in the latest release, make sure to have [wasi-libc](https://github.com/WebAssembly/wasi-libc) installed. Build it with threads enabled, e.g.
+
+```shell
+make \
+    AR=/opt/wasi-sdk/bin/llvm-ar \
+    NM=/opt/wasi-sdk/bin/llvm-nm \
+    CC=/opt/wasi-sdk/bin/clang \
+    THREAD_MODEL=posix
+```
+
+Build and run the samples
+
+```shell
+$ mkdir build
+$ cd build
+$ cmake -DWASI_SYSROOT=/path/to/wasi-libc/sysroot ..
+$ make
+...
+$ ./iwasm wasm-apps/no_pthread.wasm
+...
+$ ./iwasm wasm-apps/exception_propagation.wasm
+```