Update README.md

Author: MauroDeryckere

README.md

@@ -26,3 +26,21 @@ auto parsed{ MauUUID::UUID::FromString(str) };
 assert(parsed == id);
 
 ```
+
+## Building
+This library uses CMake for building. Example:
+
+### Basic build (includes tests)
+```bash
+cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+cmake --build build
+```
+
+### Build without tests
+```bash
+cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug -DMAU_UUID_BUILD_TESTS=ON
+cmake --build build
+cd build
+ctest --output-on-failure
+```
+Or set the option to OFF when adding the project in your cmake file to disable tests.