Add arch installation instructions

arch-install-checklist.md

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+## Set keyboard layout
+Default layout will be US
+`ls /usr/share/kbd/keymaps/**/*.map.gz` <- list keymaps
+`loadkeys de-latin1` <- modify layout
+
+## Verify boot mode
+`ls /sys/firmware/efi/efivars` <- if exist, system is UEFI, else legacy BIOS
+
+## Internet connection
+Ethernet connection is automatic, WiFi:
+`ip link` <- check network interface works and is enabled
+`iwctl` <- authenticate to your WiFi network
+
+`ping archlinux.org` <- test connection
+
+## System clock
+`timedatectl set-ntp true` <- make sure the clock will be accurate
+`timedatectl status` <- check the status
+
+## Partition the disk
+`fdisk /dev/sdX` <- make partitions
+- EFI (if UEFI)
+- Swap
+- Root
+- (Home)
+
+## Format the partitions and make filesystems
+`mkfs.ext4 /dev/root_partition`
+`mkfs.fat -F32 /dev/efi_system_partition`
+`mkswap /dev/swap_partition`
+
+## Mount the file systems
+`mount /dev/root_partition /mnt`
+`mount /dev/efi_system_partition /mnt/boot`
+`swapon /dev/swap_partition`
+
+## Install essentials
+First select mirrors (`/etc/pacman.d/mirrorlist`)
+`pacstrap /mnt base linux linux-firmware base-devel NetworkManager vim`
+
+## Fstab
+`genfstab -U /mnt >> /mnt/etc/fstab`
+
+## Chroot
+`arch-chroot /mnt`
+
+## Set time zone
+`ln -sf /usr/share/zoneinfo/Region/Ciry /etc/localtime` <- specify timezone
+`hwclock --systohc` <- synchronize clock, to generate `/etc/adjtime`
+
+## Localization
+Edit `/etc/locale.gen` and uncomment `en_US.UTF-8 UTF-8` and ISO locales
+`locale-gen` <- Generate locales
+
+Set LANG variable in `locale.conf`:
+```
+LANG=en_US.UTF-8
+```
+
+Set persistent keyboard layout in `/etc/vconsole.conf`
+(This will default to english, if not set)
+```
+KEYMAP=de-latin1
+```
+
+## Network Config
+Define hostname in `/etc/hostname` (name of computer)
+Add matching entries to `/etc/hosts`
+```
+127.0.0.1	localhost
+::1			localhost
+127.0.1.1	hostname.localdomain	hostname
+```
+
+## Set root password or make other account
+`passwd` <- Set root password
+
+It's better to work with priviledged user rather than root account directly.
+To do this, we first have to install `sudo` and `vim`. (We did this with `pacstrap`)
+After that, we can edit the configuration by `sudo EDITOR=vim visudo`, in which we will uncomment the line `%wheel ALL=(ALL) ALL` and save
+
+After sudo is set up and `wheel` group is allowed to use it, we can make the user:
+`useradd -G wheel,admin -d /path/to/home -m username -`
+`passwd username`
+
+After this, we can login as this user and make sure everything works as it shoud:
+`sudo su username`
+
+## Install bootloader
+This will only cover grub, for other bootloaders, visit `https://wiki.archlinux.org/index.php/Arch_boot_process#Boot_loader`
+
+Install `grub` package with pacman
+Note: To detect other operating systems too, you will also need `os-prober` package, also with NTFS systems, if windows isn't detected, try installing `ntfs-3g` and remounting
+
+
+UEFI:
+`efibootmgr` package is also needed for UEFI systems
+`grub-install --target=x86_64-efi --efi-directory=boot --bootloader-id=GRUB`
+BIOS (Legacy):
+`grub-install --target=i386-pc /dev/sdX`, where sdX is the disk, **not a partition**
+
+Note: `--removable` option can be used, which will allow booting if EFI variables are reset or you move to another PC
+
+### Generating grub configuration
+`grub-mkconfig -o /boot/grub/grub.cfg`