Add 'README.MD'

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README.MD

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+## SYNOPSIS
+  
+__archbuilder__ is a wrapper for makepkg which uses [buildah] (https://buildah.io/) containers
+to run the working makepkg.
+This will lead to a clean host system and reproduceble builds for the packages.
+
+__archbuilder__ works great together with [aurutils] (https://github.com/AladW/aurutils) to have 
+a great [Arch User Repository] (https://wiki.archlinux.org/index.php/Arch_User_Repository) toolset.
+  
+## INSTALLATION
+
+Install the following packages:
+
+* [`archbuilder`](https://aur.archlinux.org/packages/archbuilder)
+
+and optional aurutils:
+* [`aurutils`](https://aur.archlinux.org/packages/aurutils)
+
+## CONFIGURATION
+
+The base configuration file is located under /etc/archbuilder/archbuilder.env and includes the following settings:
+
+* ARCHBUILDER_BASE_DIR="${HOME}/.archbuilder"
+> This is the base dir, which will used by archbuilder to store working files
+* ARCHBUILDER_IMAGE_NAME="archbuilder"
+> The name of the buildah image to be used for building packages
+* ARCHBUILDER_CACHE_REPO="${ARCHBUILDER_BASE_DIR}/crepo"
+> The cache repository for the containers. This repository will be used
+> by the containers to fetch the builded packages as dependencies.
+> Every builded package by archbuilder will be added to this repository
+* ARCHBUILDER_LOG_PATH="${ARCHBUILDER_BASE_DIR}/logs"
+> Log directory. This is used to store logfiles when ARCH_BUILDER_LOG_TO_FILE is set.
+* ARCHBUILDER_LOG_TO_FILE=1
+> If logs should be written to files
+* LOG_LEVEL_STDOUT="INFO"
+> The log level to be used for stdout. Possible values are "DEBUG", "INFO", "WARNING", "SUCCESS", "ERROR"
+* LOG_LEVEL_LOG="INFO"
+> The log level to be used for logging to file. Possible values are "DEBUG", "INFO", "WARNING", "SUCCESS", "ERROR"
+
+## USAGE
+
+Basic usage will be just to run archbuilder inside a folder with a PKGBUILD file.
+It will replace makepkg for the build process by using buildah.
+
+    archbuilder
+    
+If you want to pass flags of makepkg to archbuilder just hand them over after two dashes:
+
+    archbuilder -- --syncdeps
+
+For a list of possible arguments just use the help flag:
+
+    archbuilder --help
+    
+## SETUP WITH AURUTILS
+
+Create a user or grant your user the permissions to run buildah via subuid and subgid for a more detailed documentation check the [wiki] (https://wiki.archlinux.org/title/Buildah):
+
+    /etc/subuid
+    youruser:100000:65536
+    
+    /etc/subgid
+    youruser:100000:65536
+    
+Create a repository, that is owned by this user for using [aurutils] (https://github.com/AladW/aurutils):
+
+    mkdir /var/cache/pacman/myrepo
+    chown -R youruser: /var/cache/pacman/myrepo
+    sudo -u youruser repo-add /var/cache/pacman/myrepo/myrepo.db.tar.gz
+    
+    /etc/pacman.d/myrepo:
+    [myrepo]
+    SigLevel = Optional TrustAll
+    Server = file:///var/cache/pacman/myrepo
+    
+    /etc/pacman.conf
+    Include = /etc/pacman.d/myrepo
+    
+    pacman -Sy
+    
+To use now archbuilder as building backend inside aurutils, just add the following to your shell:
+
+    export MAKEPKG="/usr/bin/archbuilderwrap"
+    
+This script will wrap everything correct to archbuilder and run the makepkg inside the buildah container.
+
+You can add custom parameters to the wrapper script by setting the variable ARCHBUILDER_FLAGS.