doc(wamr): document how to run proposal tests in WAMR (#37)

Author: eloparco

test/README.md

@@ -1,13 +1,23 @@
 # Running tests
 
-The following command executes the `wasi-threads` tests using the Wasmtime
-runtime.
-
 ```bash
 git clone -b prod/testsuite-all https://github.com/WebAssembly/wasi-testsuite
 cd wasi-testsuite/
+```
+
+To execute the `wasi-threads` tests using the Wasmtime
+runtime:
+```bash
 TEST_RUNTIME_EXE="wasmtime --wasm-features=threads --wasi-modules=experimental-wasi-threads" python3 test-runner/wasi_test_runner.py \
-    -r adapters/wasmtime.sh \
+    -r adapters/wasmtime.py \
+    -t tests/proposals/wasi-threads/
+```
+
+To execute the `wasi-threads` tests using the WAMR
+runtime:
+```bash
+TEST_RUNTIME_EXE="iwasm" python3 test-runner/wasi_test_runner.py \
+    -r adapters/wasm-micro-runtime.py \
     -t tests/proposals/wasi-threads/
 ```