add new matrix mat4x2

Initial function being

glm_mat4x2_make

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

docs/source/api_inline_array.rst

@@ -52,6 +52,7 @@ Follow the :doc:`build` documentation for this
    mat3x2
    mat3x4
    mat4
+   mat4x2
    vec2
    vec2-ext
    vec3

docs/source/mat4x2.rst

@@ -0,0 +1,30 @@
+.. default-domain:: C
+
+mat4x2
+======
+
+Header: cglm/mat4x2.h
+
+Table of contents (click to go):
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Macros:
+
+1. GLM_MAT4X2_ZERO_INIT
+#. GLM_MAT4X2_ZERO
+
+Functions:
+
+1. :c:func:`glm_mat4x2_make`
+
+Functions documentation
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. c:function:: void glm_mat4x2_make(float * __restrict src, mat4x2 dest)
+
+    Create mat4x2 matrix from pointer
+
+    | NOTE: **@src** must contain at least 8 elements.
+    Parameters:
+      | *[in]*  **src**  pointer to an array of floats
+      | *[out]* **dest** destination matrix4x2