tests(unit): Add llm-enhanced-test submodule integration

Signed-off-by: zhenweijin <zhenwei.jin@intel.com>

Author: kylo5aby

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "tests/unit/llm-enhanced-test"]
+	path = tests/unit/llm-enhanced-test
+	url = https://github.com/wasm-micro-runtime/llm-enhanced-test.git

tests/unit/CMakeLists.txt

@@ -90,6 +90,7 @@ add_subdirectory(unsupported-features)
 add_subdirectory(smart-tests)
 add_subdirectory(exception-handling)
 add_subdirectory(running-modes)
+add_subdirectory(llm-enhanced-test)
 
 if(WAMR_BUILD_TARGET STREQUAL "X86_64")
   add_subdirectory(aot-stack-frame)

tests/unit/README.md

@@ -92,6 +92,22 @@ When creating a `CMakeLists.txt` file for your test suite, follow these best pra
 
 ---
 
+## Initializing Submodules
+
+Test suite `llm-enhanced-test` is maintained in separate repository and included as git submodule. You need to initialize it before building.
+
+```bash
+git submodule update --init --recursive
+```
+
+Alternatively, if you haven't cloned the repository yet, use `--recursive` when cloning:
+
+```bash
+git clone --recursive https://github.com/bytecodealliance/wasm-micro-runtime.git
+```
+
+---
+
 ## Compiling and Running Test Cases
 
 To compile and run the test cases, follow these steps: