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 (closed) Closes #3 (closed)

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