mat2: add new function glm_mat2_make

Function takes in a 4 element float array
and converts it into a mat2 matrix.

Signed-off-by: Vincent Davis Jr <vince@underview.tech>

docs/source/mat2.rst

@@ -32,6 +32,7 @@ Functions:
 #. :c:func:`glm_mat2_swap_col`
 #. :c:func:`glm_mat2_swap_row`
 #. :c:func:`glm_mat2_rmc`
+#. :c:func:`glm_mat2_make`
 
 Functions documentation
 ~~~~~~~~~~~~~~~~~~~~~~~
@@ -177,3 +178,13 @@ Functions documentation
 
     Returns:
         scalar value e.g. Matrix1x1
+
+.. c:function:: void glm_mat2_make(float * __restrict src, mat2 dest)
+
+    Create mat2 matrix from pointer
+
+    | NOTE: **@src** must contain 4 elements.
+
+    Parameters:
+      | *[in]*  **src**  pointer to an array of floats
+      | *[out]* **dest** destination matrix2x2