Add support, dependency and license info to README.
Add support, dependency and license info to README.

JelteF/PyLaTeX,ovaskevich/PyLaTeX,votti/PyLaTeX,sebastianhaas/PyLaTeX,ovaskevich/PyLaTeX,JelteF/PyLaTeX,bjodah/PyLaTeX,jendas1/PyLaTeX,sebastianhaas/PyLaTeX,votti/PyLaTeX,bjodah/PyLaTeX,jendas1/PyLaTeX