EIB Download Design (#314)

* initial downloads.md

* fix mistake

* Update downloads.md

docs/design/downloads.md

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+# Edge Image Builder Downloads
+
+## EIB Builder Image Container Downloads
+
+These packages are necessary for building the EIB binary.
+```
+gpgme-devel
+device-mapper-devel
+libbtrfs-devel
+```
+
+## EIB Deliverable Image Container Downloads
+
+These packages are used by EIB to build the RTD image. Some of these package binaries may be copied to the RTD image.
+
+Repository
+```
+https://download.opensuse.org/repositories/isv:SUSE:Edge:EdgeImageBuilder/SLE-15-SP5/isv:SUSE:Edge:EdgeImageBuilder.repo
+```
+Packages
+```
+xorriso
+squashfs
+libguestfs
+kernel-default
+e2fsprogs
+parted
+gptfdisk
+btrfsprogs
+guestfs-tools
+lvm2
+podman
+createrepo_c
+helm
+hauler
+nm-configurator 
+```
+
+## EIB Deliverable Image Programmatic Downloads
+
+These artifacts are programmatically downloaded by EIB during build time. Some of these artifacts may be copied to the RTD image.
+
+### Elemental
+Source
+```
+https://download.opensuse.org/repositories/isv:/Rancher:/Elemental:/Maintenance:/5.5/standard/
+```
+Packages
+```
+elemental-register
+elemental-system-agent
+```
+
+### RKE2/K3s
+#### Releases 
+
+Sources
+```
+https://github.com/rancher/rke2/releases/download/
+https://github.com/k3s-io/k3s/releases/download/
+```
+Artifacts
+```
+RKE2 Binary
+RKE2 Core Images
+RKE2 Checksums
+RKE2 Calico Images
+RKE2 Canal Images
+RKE2 Cilium Images
+RKE2 Multus Images
+
+K3s Binary
+K3s Images
+```
+
+#### Installation Script
+
+Sources
+```
+https://get.rke2.io
+https://get.k3s.io
+```
+Artifacts
+```
+RKE2 Install Script
+K3s Install Script
+```
+
+#### SELinux
+
+Sources
+```
+https://rpm.rancher.io/k3s/stable/common/slemicro/noarch
+https://rpm.rancher.io/rke2/stable/common/slemicro/noarch
+```
+Artifacts
+```
+rke2-selinux
+k3s-selinux
+```