Update README

README.md

@@ -3,3 +3,17 @@
 **Wizard Apprentice Standard Library** (`wapp`) is a lightweight collection of reusable utilities for **C and C++** projects.
 
 For more information about the library and how to use it, check the [wiki](https://git.thewizardapprentice.com/abdelrahman/wizapp-stdlib/wiki).
+
+## Building
+
+Linux/macOS
+
+```console
+./build
+```
+
+Windows
+
+```console
+./build.ps1
+```