docs: building cglm

docs/source/index.rst

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+.. cglm documentation master file, created by
+   sphinx-quickstart on Tue Jun  6 20:31:05 2017.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to cglm's documentation!
+================================
+
+**cglm** is optimized 3D math library written in C99 (compatible with C89).
+It is similar to original **glm** library except this is mainly for **C**
+
+This library stores matrices as row-major order but in the future column-major
+is considered to be supported as optional.
+
+Also currently only **float** type is supported for most operations.
+
+**Features**
+
+* general purpose matrix operations (mat4, mat3)
+* chain matrix multiplication (square only)
+* general purpose vector operations (cross, dot, rotate, proj, angle...)
+* affine transforms
+* matrix decomposition (extract rotation, scaling factor)
+* optimized affine transform matrices (mul, rigid-body inverse)
+* camera (lookat)
+* projections (ortho, perspective)
+* quaternions
+* euler angles / yaw-pitch-roll to matrix
+* extract euler angles
+* inline or pre-compiled function call
+* more features (todo)
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Table Of Contents:
+
+   build
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`