initial installation guide

INSTALL.md

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+# Iglunix Installation Guide
+
+## Getting an installation image
+There are two ways of getting hold of an install image: From the releases tab on
+GitHub and with [iglunix-autobuild](https://github.com/iglunix/iglunix-autobuild).
+
+### Using Autobuild
+```
+git clone https://github.com/iglunix/iglunix-autobuild
+cd iglunix-autobuild
+./autobuild.sh
+./chroot.sh
+./img.sh
+```
+
+### Writing the image
+Write the image to a USB to boot on the target computer.
+Make sure to triple check which disk you're writing to.
+```
+dd if=build/iglunix.img of=/dev/sdX bs=64M
+```
+
+## Disk Partitioning
+Iglunix recommends a two partition layout with an MBR partition table, a FAT
+formatted boot partition and an EXT4 formated root partition. The following
+is a guide on how to do it where `/dev/disk` is the target install disk.
+```
+fdisk /dev/disk
+>o
+>n
+>p
+>1
+>2048
+>+512M
+>t
+>ef
+>n
+>p
+>2
+>
+>
+>w
+
+mkfs.vfat -n BOOT /dev/disk1
+mkfs.ext4 -L ROOT /dev/disk2
+mkdir /install_root
+mount /dev/disk2 /install_root
+mkdir /install_root/boot
+mount /dev/disk1 /install_root/boot
+```
+
+## Extracting Packages
+For any packages you want to install
+```
+tar -I zstd -xf /mnt/<pkgname>.<pkgver>.tar.zst -C /install_root
+```
+
+## Installing Bootloaders
+
+```
+limine-deploy /dev/disk
+cp /usr/share/limine/limine.sys /install_root/boot
+# If the oslo package wasn't installed earlier and you want UEFI support
+cp /usr/share/limine/BOOTX64.EFI /install_root/boot/efi/boot/bootx64.efi
+```
+Edit `/install_root/boot/efi/oslo/entries.ini` and `/install_root/boot/limine.cfg`
+accordingly