updated cmake build documentation

build/cmake/README.md

diff --git a/build/cmake/README.md b/build/cmake/README.md
index 44d42b2..871c894 100644
--- a/build/cmake/README.md
+++ b/build/cmake/README.md
@@ -1,34 +1,54 @@
 
-## Usage
+# xxHash CMake Integration
 
-### Way 1: import targets
-Build xxHash targets:
+This document explains how to integrate xxHash into your CMake project. Choose the method that best fits your needs.
 
-    cd </path/to/xxHash/>
-    cmake -S build/cmake -B cmake_build
-    cmake --build cmake_build --parallel
-    cmake --install cmake_build
+## Method 1: Install and Import (Recommended)
 
-Where possible options are:
-- `-DXXHASH_BUILD_XXHSUM=<ON|OFF>`: build the command line binary. ON by default
-- `-DBUILD_SHARED_LIBS=<ON|OFF>`: build dynamic library. ON by default.
-- `-DCMAKE_INSTALL_PREFIX=<path>`: use custom install prefix path.
-- `-DDISPATCH=<ON|OFF>`: enable dispatch mode. Default is ON for x64 cpus, OFF otherwise.
+**Best for:** Projects that want to use xxHash as a system-wide library.
 
-Add lines into downstream CMakeLists.txt:
+### Step 1: Build and Install xxHash
 
-    find_package(xxHash 0.8 CONFIG REQUIRED)
-    ...
-    target_link_libraries(MyTarget PRIVATE xxHash::xxhash)
+```bash
+cd /path/to/xxHash
+cmake -S build/cmake -B cmake_build
+cmake --build cmake_build --parallel
+cmake --install cmake_build
+```
 
-### Way 2: Add subdirectory
-Add lines into downstream CMakeLists.txt:
+### Step 2: Use in Your Project
 
-    option(BUILD_SHARED_LIBS "Build shared libs" OFF) #optional
-    ...
-    set(XXHASH_BUILD_ENABLE_INLINE_API OFF) #optional
-    set(XXHASH_BUILD_XXHSUM OFF) #optional
-    add_subdirectory(</path/to/xxHash/build/cmake/> </path/to/xxHash/build/> EXCLUDE_FROM_ALL)
-    ...
-    target_link_libraries(MyTarget PRIVATE xxHash::xxhash)
+Add to your `CMakeLists.txt`:
+
+```cmake
+find_package(xxHash 0.8 CONFIG REQUIRED)
+target_link_libraries(YourTarget PRIVATE xxHash::xxhash)
+```
+
+### Build Options
+
+Configure the build with these options:
+
+- `-DXXHASH_BUILD_XXHSUM=OFF` - Skip building the command line tool (default: ON)
+- `-DBUILD_SHARED_LIBS=OFF` - Build static library instead of shared (default: ON)
+- `-DCMAKE_INSTALL_PREFIX=/custom/path` - Install to custom location
+- `-DDISPATCH=OFF` - Disable CPU dispatch optimization (default: ON for x64)
+
+## Method 2: Add as Subdirectory
+
+**Best for:** Projects that want to bundle xxHash directly without system installation.
+
+Add to your `CMakeLists.txt`:
+
+```cmake
+# Optional: Configure xxHash before adding
+set(XXHASH_BUILD_XXHSUM OFF)        # Don't build command line tool
+option(BUILD_SHARED_LIBS OFF)       # Build static library
+
+# Add xxHash to your project
+add_subdirectory(path/to/xxHash/build/cmake xxhash_build EXCLUDE_FROM_ALL)
+
+# Link to your target
+target_link_libraries(YourTarget PRIVATE xxHash::xxhash)
+```