actually add include folder

vendor/raylib-cpp/include/raymath.hpp

@@ -0,0 +1,27 @@
+/**
+ * C++ header to wrap raymath.h.
+ */
+#ifndef RAYLIB_CPP_INCLUDE_RAYMATH_HPP_
+#define RAYLIB_CPP_INCLUDE_RAYMATH_HPP_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifndef RAYLIB_CPP_NO_MATH
+#ifndef RAYMATH_STATIC_INLINE
+#define RAYMATH_STATIC_INLINE
+#endif
+#ifdef __GNUC__
+#pragma GCC diagnostic push  // These throw a warnings on visual studio, need to check if __GNUC__ is defined to use it.
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#endif
+#include "raymath.h" // NOLINT
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // RAYLIB_CPP_INCLUDE_RAYMATH_HPP_