added the readme

dependencies/includes/glm/gtx/matrix_cross_product.hpp

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+/// @ref gtx_matrix_cross_product
+/// @file glm/gtx/matrix_cross_product.hpp
+///
+/// @see core (dependence)
+/// @see gtx_extented_min_max (dependence)
+///
+/// @defgroup gtx_matrix_cross_product GLM_GTX_matrix_cross_product
+/// @ingroup gtx
+///
+/// @brief Build cross product matrices
+///
+/// <glm/gtx/matrix_cross_product.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependency:
+#include "../glm.hpp"
+
+#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_matrix_cross_product extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_matrix_cross_product
+	/// @{
+
+	//! Build a cross product matrix.
+	//! From GLM_GTX_matrix_cross_product extension.
+	template <typename T, precision P>
+	GLM_FUNC_DECL tmat3x3<T, P> matrixCross3(
+		tvec3<T, P> const & x);
+		
+	//! Build a cross product matrix.
+	//! From GLM_GTX_matrix_cross_product extension.
+	template <typename T, precision P>
+	GLM_FUNC_DECL tmat4x4<T, P> matrixCross4(
+		tvec3<T, P> const & x);
+
+	/// @}
+}//namespace glm
+
+#include "matrix_cross_product.inl"