ADDED: Comment about Matrix conventions

src/raymath.h

@@ -3,6 +3,11 @@
 *   raymath v1.5 - Math functions to work with Vector2, Vector3, Matrix and Quaternions
 *
 *   CONVENTIONS:
+*     - Matrix structure is defined as row-major (memory layout) but parameters naming AND all 
+*       math operations performed by the library consider the structure as it was column-major
+*       It is like transposed versions of the matrices are used for all the maths
+*       It benefits some functions making them cache-friendly and also avoids matrix 
+*       transpositions sometimes required by OpenGL
 *     - Functions are always self-contained, no function use another raymath function inside,
 *       required code is directly re-implemented inside
 *     - Functions input parameters are always received by value (2 unavoidable exceptions)