feat: add mat4 init functions

src/main.c

@@ -1,7 +1,13 @@
 #include <stdio.h>
-#include "math/vec4.h"
+#include "math/mat4.h"
 
 int main(void) 
 {
+    float arr[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
+    Mat4f_t mat1 =  mat4f_from_array(arr);
+    Mat4f_t mat2 =  mat4f_scalar(1);
+    Mat4f_t mat3 =  mat4f_zero();
+    Mat4f_t mat4 =  mat4f_identity();
+    printf("%f", arr[1]);
     return 0;
 }