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, 12 insertions, 2 deletions

diff --git a/.editorconfig b/.editorconfig
index 4a540f3..74ed4eb 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,5 +1,7 @@
-# EditorConfig configuration for archiso
-# http://EditorConfig.org
+# EditorConfig for archiso
+# https://editorconfig.org/
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 # Top-most EditorConfig file
 root = true
@@ -22,3 +24,11 @@ trim_trailing_whitespace = true
 charset = utf-8
 indent_style = space
 indent_size = 2
+
+[*.rst]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 2