Add README

Author: lfdevs

.github/README.md

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+# Arch Linux ARM Images
+Forked From [Arch Linux / archlinux-docker · GitLab](https://gitlab.archlinux.org/archlinux/archlinux-docker)
+
+---
+
+This repository provides Docker container images in Docker Hub: https://hub.docker.com/r/lfdevs/archlinuxarm
+
+```bash
+docker pull lfdevs/archlinuxarm:base-devel
+```
+
+Only one version of the images is provided currently: `base-devel` (approx. 300 MiB)
+
+It is strongly recommended running `pacman -Syyu` right after starting a container due to the rolling release nature of Arch Linux.
+
+## Build
+This image is automatically built once a month on the 8th using [GitHub Actions](https://github.com/lfdevs/archlinuxarm-docker/actions/workflows/build.yml).
+
+The Rootfs used in this image is from the Arch Linux ARM official website: http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz