Add GitHub workflow and luacheck (#545)

David Leal

2020-06-12 a8daa417c485ee20716ec050d4c676b5c91af773

 README.md

@@ -1,6 +1,9 @@
Technic
=======

[![Build status](https://github.com/minetest-mods/technic/workflows/Check%20&%20Release/badge.svg)](https://github.com/minetest-mods/technic/actions)
[![License](https://img.shields.io/badge/license-LGPLv2.0%2B-purple.svg)](https://www.gnu.org/licenses/old-licenses/lgpl-2.0.en.html)

Credits for contributing to the project (in alphabetical order):
  * kpoppel
  * Nekogloop