Add license and basic documentation

LICENSE:
Add GPL-3.0 license.

{{archiso,configs}/*,.editorconfig,.gitlab-ci.yml}:
Add SPDX license identifier.

Makefile:
Add SPDX license identifier.
Install the `run_archiso.sh` script as global executable `run_archiso`.
Use -D and -t flags to install to install files more generically (without a previous call to install the directory).

README.rst:
Add README outlining the project's scope, how to build images from the profiles and how to test.

AUTHORS.rst:
Add list of all direct contributors to the repository.

CONTRIBUTING.rst:
Add basic contribution guidelines, explaining the linter and the license in use.

Closes #7
Closes #3

1 files changed, 33 insertions, 0 deletions

diff --git a/AUTHORS.rst b/AUTHORS.rst
new file mode 100644
index 0000000..4fe0eb5
--- /dev/null
+++ b/AUTHORS.rst
@@ -0,0 +1,33 @@
+===============
+Archiso Authors
+===============
+
+* Aaron Griffin <aaron@archlinux.org>
+* Adam Purkrt <adam@purkrt.net>
+* Chandan Singh <cks071g2@gmail.com>
+* Charles Vejnar <ce@vejnar.org>
+* Christian Hesse <mail@eworm.de>
+* Christopher Brannon <cmbrannon79@gmail.com>
+* Dan McGee <dan@archlinux.org>
+* David Runge <dvzrv@archlinux.org>
+* David Thurstenson <thurstylark@gmail.com>
+* Dieter Plaetinck <dieter@plaetinck.be>
+* Eli Schwartz <eschwartz@archlinux.org>
+* Florian Pritz <bluewind@xinu.at>
+* Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
+* Gerhard Brauer <gerbra@archlinux.de>
+* James Sitegen <jamesm.sitegen@gmail.com>
+* Justin Kromlinger <hashworks@archlinux.org>
+* Keshav Amburay <the.ridikulus.rat@gmail.com>
+* Loui Chang <louipc.ist@gmail.com>
+* Lukas Fleischer <archlinux@cryptocrack.de>
+* Martin Damian Fernandez <martin.damian.fernandez@gmail.com>
+* Pierre Schmitz <pierre@archlinux.de>
+* Sean Enck <enckse@voidedtech.com>
+* Simo Leone <simo@archlinux.org>
+* Steffen Bönigk <boenki@gmx.de>
+* Sven-Hendrik Haase <sh@lutzhaase.com>
+* Thomas Bächler <thomas@archlinux.org>
+* Yu Li-Yu <afg984@gmail.com>
+* nl6720 <nl6720@gmail.com>
+* Øyvind Heggstad <heggstad@gmail.com>