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

3 files changed, 9 insertions, 0 deletions

diff --git a/configs/releng/efiboot/loader/entries/archiso-x86_64-cd.conf b/configs/releng/efiboot/loader/entries/archiso-x86_64-cd.conf
index b660f1d..52d9536 100644
--- a/configs/releng/efiboot/loader/entries/archiso-x86_64-cd.conf
+++ b/configs/releng/efiboot/loader/entries/archiso-x86_64-cd.conf
@@ -1,3 +1,6 @@
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 title   Arch Linux install medium (x86_64, UEFI)
 linux   /EFI/archiso/vmlinuz-linux
 initrd  /EFI/archiso/intel-ucode.img
diff --git a/configs/releng/efiboot/loader/entries/archiso-x86_64-usb.conf b/configs/releng/efiboot/loader/entries/archiso-x86_64-usb.conf
index 78c7d23..e1a3908 100644
--- a/configs/releng/efiboot/loader/entries/archiso-x86_64-usb.conf
+++ b/configs/releng/efiboot/loader/entries/archiso-x86_64-usb.conf
@@ -1,3 +1,6 @@
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 title   Arch Linux install medium (x86_64, UEFI)
 linux   /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 initrd  /%INSTALL_DIR%/boot/intel-ucode.img
diff --git a/configs/releng/efiboot/loader/loader.conf b/configs/releng/efiboot/loader/loader.conf
index 9a0049c..fd7db27 100644
--- a/configs/releng/efiboot/loader/loader.conf
+++ b/configs/releng/efiboot/loader/loader.conf
@@ -1,2 +1,5 @@
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 timeout 3
 default archiso-x86_64.conf