add cmake install test

run_cmake_install_test.sh

@@ -0,0 +1,28 @@
+rm -rf install
+mkdir -p install/build
+cd install/build
+cmake ../../ -DCMAKE_INSTALL_PREFIX=../pocketpy -DPK_USE_CJSON=ON -DPK_ENABLE_OS=ON
+cmake --build . --target install --config Release -j 8
+
+if [ -e "../pocketpy/lib/libpocketpy.so" ]; then
+    echo "Library installed successfully."
+else
+    echo "Library installation failed."
+    exit 1
+fi
+
+if [ -e "../pocketpy/include/pocketpy.h" ]; then
+    echo "Header files installed successfully."
+else
+    echo "Header files installation failed."
+    exit 1
+fi
+
+if [ -e "../pocketpy/share/pocketpy/pocketpy-config.cmake" ]; then
+    echo "Config file installed successfully."
+else
+    echo "Config file installation failed."
+    exit 1
+fi
+
+echo "CMake install verified successfully."