Add raylib library

libs/raylib-4.5.0/projects/CodeBlocks/README.md

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+# raylib template for Code::Blocks
+
+1. Install raylib. 
+
+On Windows you should install the **Windows Installer (with MinGW compiler)** package.
+On other platforms you can install however you like following the instructions in the wiki.
+
+    * https://github.com/raysan5/raylib/releases/download/4.2.0/raylib_installer_v420.mingw.exe
+    * https://github.com/raysan5/raylib/wiki/Working-on-GNU-Linux
+    * https://github.com/raysan5/raylib/wiki/Working-on-macOS
+
+2. Install and run Code::Blocks.
+
+3. **Windows only**: Select `Settings` `Compiler` `Toolchain executables`.
+Change `Compiler's installation directory` to `C:\raylib\MingGW`.  Do *not* press auto-detect.
+There is a screenshot below showing how it should look.  Press `OK`.
+
+4. Select `File` `Open` and open the `core_basic_windows.cbp` file.
+
+![Compiler Settings](compiler_settings.png)
+
+For an example with resources, see https://github.com/electronstudio/raylib-game-template-codeblocks