Update README.md

README.md

@@ -5,3 +5,25 @@
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/a70beb37999b4a6298de4e4d3b3510d8)](https://www.codacy.com/gh/ZgblKylin/KtUtils/dashboard?utm_source=github.com&utm_medium=referral&utm_content=ZgblKylin/KtUtils&utm_campaign=Badge_Grade)
 
 Qt Utilities by ZgblKylin.
+
+## Build
+
+This project is designed to be integrate as a sub_directory.
+
+### Configure
+
+Two CMake built-in options are used:
+
+- `BUILD_SHARED_LIBS`: `OFF` by default, enable to build shared libraries.
+- `BUILD_TESTING`: `OFF` by default, enable to build tests.
+
+### Compile
+
+Just add these codes into your `CMakeLists.txt`
+
+```cmake
+add_subdirectory(KtUtils)
+target_link_library(${PROJECT_NAME} PUBLIC KtUtils)
+```
+
+Then it'll export precompile header `<KtUtils/global>` to your project. Feel free to use everything without manually include header files!