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

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+=======
+archiso
+=======
+
+The archiso project features scripts and configuration templates to build installation media (*.iso* images) for BIOS
+and UEFI based systems on the x86_64 architecture.
+Currently creating the images is only supported on Arch Linux.
+
+Requirements
+============
+
+The following packages need to be installed to be able to create an image with the included scripts:
+
+* arch-install-scripts
+* dosfstools
+* e2fsprogs
+* edk2-shell
+* libisoburn
+* squashfs-tools
+
+For running the images in a virtualized test environment the following packages are required:
+
+* edk2-ovmf
+* qemu
+
+For linting the shell scripts the following package is required:
+
+* shellcheck
+
+Profiles
+========
+
+Archiso comes with two profiles: **baseline** and **releng**. While both can serve as starting points for creating
+custom live media, **releng** is used to create the monthly installation medium.
+They can be found below `configs/baseline/ <configs/baseline/>`_  and `configs/releng/ <configs/releng/>`_
+(respectively). Both profiles are defined by files to be placed into overlays (e.g. *airootfs* -> *the image's /*) and
+dynamic actions (i.e. *build.sh* scripts).
+
+Create images
+=============
+
+Usually the archiso tools are installed as a package. However, it is also possible to clone this repository and create
+images without installing archiso system-wide.
+
+As filesystems are created and various mount actions have to be done when creating an image, **root** is required to run
+the scripts.
+
+When archiso is installed system-wide and the modification of a profile is desired, it is necessary to copy it to a
+writeable location, as */usr/share/archiso* is tracked by the package manager and only writeable by root (changes will
+be lost on update).
+
+The examples below will assume an unmodified profile in a system location (unless noted otherwise).
+
+It is advised to check the help information of the **build.sh** scripts in the profiles:
+
+  .. code:: bash
+
+    /usr/share/archiso/configs/releng/build.sh --help
+
+Create images with packaged archiso
+-----------------------------------
+
+  .. code:: bash
+
+    /usr/share/archiso/configs/releng/build.sh -w path/to/work_dir -o path/to/out_dir
+
+Create images with local clone
+------------------------------
+
+Clone this repository and make sure to run with the local `mkarchiso <archiso/mkarchiso>`_  script in *PATH* (if it has
+been modified):
+
+  .. code:: bash
+
+    PATH="archiso:$PATH" ./configs/releng/build.sh -w path/to/work_dir -o path/to/out_dir
+
+Testing
+=======
+
+The convenience script **run_archiso** is provided to boot into the medium using qemu.
+It is advised to read its help information:
+
+  .. code:: bash
+
+    run_archiso -h
+
+Run the following to boot the iso using BIOS:
+
+  .. code:: bash
+
+    run_archiso -i path/to/an/arch.iso
+
+Run the following to boot the iso using UEFI:
+
+  .. code:: bash
+
+    run_archiso -i path/to/an/arch.iso -u
+
+The script can of course also be executed from this repository:
+
+
+  .. code:: bash
+
+    ./scripts/run_archiso.sh -i path/to/an/arch.iso
+
+Installation
+============
+
+To install archiso system-wide use the included **Makefile**:
+
+  .. code:: bash
+
+    make install
+
+License
+=======
+
+Archiso is licensed under the terms of the **GPL-3.0-or-later** (see `LICENSE <LICENSE>`_).