add new matrix mat3x2

Initial function being

glm_mat3x2_make

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

docs/source/api_inline_array.rst

@@ -49,6 +49,7 @@ Follow the :doc:`build` documentation for this
    mat2x3
    mat2x4
    mat3
+   mat3x2
    mat4
    vec2
    vec2-ext

docs/source/mat3x2.rst

@@ -0,0 +1,30 @@
+.. default-domain:: C
+
+mat3x2
+======
+
+Header: cglm/mat3x2.h
+
+Table of contents (click to go):
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Macros:
+
+1. GLM_MAT3X2_ZERO_INIT
+#. GLM_MAT3x2_ZERO
+
+Functions:
+
+1. :c:func:`glm_mat3x2_make`
+
+Functions documentation
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. c:function:: void glm_mat3x2_make(float * __restrict src, mat3x2 dest)
+
+    Create mat3x2 matrix from pointer
+
+    | NOTE: **@src** must contain at least 6 elements.
+    Parameters:
+      | *[in]*  **src**  pointer to an array of floats
+      | *[out]* **dest** destination matrix3x2