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

7 files changed, 14 insertions, 0 deletions

diff --git a/hooks/archiso b/hooks/archiso
index 7f2f9a7..a12c260 100644
--- a/hooks/archiso
+++ b/hooks/archiso
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 # args: source, newroot, mountpoint
 _mnt_dmsnapshot() {
diff --git a/hooks/archiso_loop_mnt b/hooks/archiso_loop_mnt
index 2c607f5..41899e4 100644
--- a/hooks/archiso_loop_mnt
+++ b/hooks/archiso_loop_mnt
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_hook () {
     # shellcheck disable=SC2154
diff --git a/hooks/archiso_pxe_common b/hooks/archiso_pxe_common
index bf8e883..f02ef12 100644
--- a/hooks/archiso_pxe_common
+++ b/hooks/archiso_pxe_common
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_hook () {
     # Do *not* declare 'bootif_dev' local! We need it in run_latehook().
diff --git a/hooks/archiso_pxe_http b/hooks/archiso_pxe_http
index bf2f5f4..efae923 100644
--- a/hooks/archiso_pxe_http
+++ b/hooks/archiso_pxe_http
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_hook() {
     # shellcheck disable=SC2154
diff --git a/hooks/archiso_pxe_nbd b/hooks/archiso_pxe_nbd
index 4ccbcbf..8ac44e7 100644
--- a/hooks/archiso_pxe_nbd
+++ b/hooks/archiso_pxe_nbd
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_earlyhook() {
     # shellcheck disable=SC2154
diff --git a/hooks/archiso_pxe_nfs b/hooks/archiso_pxe_nfs
index be1e4c3..9d3964b 100644
--- a/hooks/archiso_pxe_nfs
+++ b/hooks/archiso_pxe_nfs
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_hook() {
     # shellcheck disable=SC2154
diff --git a/hooks/archiso_shutdown b/hooks/archiso_shutdown
index db8fb33..ebb6b11 100644
--- a/hooks/archiso_shutdown
+++ b/hooks/archiso_shutdown
@@ -1,4 +1,6 @@
 #!/bin/ash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 run_cleanuphook() {
     rm -rf /usr/lib/modules