add new matrix mat2x3

Initial function being

glm_mat2x3_make

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

docs/source/api_inline_array.rst

@@ -46,6 +46,7 @@ Follow the :doc:`build` documentation for this
    quat
    euler
    mat2
+   mat2x3
    mat3
    mat4
    vec2

docs/source/mat2x3.rst

@@ -0,0 +1,31 @@
+.. default-domain:: C
+
+mat2x3
+======
+
+Header: cglm/mat2x3.h
+
+Table of contents (click to go):
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Macros:
+
+1. GLM_MAT2X3_ZERO_INIT
+#. GLM_MAT2x3_ZERO
+
+Functions:
+
+1. :c:func:`glm_mat2x3_make`
+
+Functions documentation
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. c:function:: void glm_mat2x3_make(float * __restrict src, mat2x3 dest)
+
+    Create mat2x3 matrix from pointer
+
+    | NOTE: **@src** must contain at least 6 elements.
+
+    Parameters:
+      | *[in]*  **src**  pointer to an array of floats
+      | *[out]* **dest** destination matrix2x3