Add library configuration

hosts/library/README.md

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+# Library
+
+## Overview
+Media and public file server.
+
+## Specs
+* CPU - AMD Ryzen 5 5600G @ 3.90GHz
+* Chipset - AMD B550
+* Memory - 64 GB DDR4
+* Motherboard - ASRock B550M Pro4
+* Case - Fractal Design Node 804
+
+### Disks
+Device | Partitions _(filesystem, size, usage)_
+--- | ---
+Samsung 980 Evo | `/dev/nvme0n1p1` (EFI, 512 MiB, NixOS Boot) <br> `/dev/nvme0n1p2` (ZFS `rpool`, 200 GiB, NixOS Root)
+
+#### ZFS datasets
+```
+rpool/
+├── local
+│   ├── nix
+│   └── tmp
+├── system
+│   ├── root
+│   └── var
+└── user
+    └── home
+
+library/
+├── books
+├── fonts
+├── movies
+├── music
+├── software
+├── tv
+├── videos
+└── web
+```
+
+See [Graham Christensen's article](https://grahamc.com/blog/nixos-on-zfs/#datasets) for the motivation behind the `rpool` datasets.
+
+### Networks
+- DHCP on `10.0.1.0/24` subnet.
+- Tailscale on `100.64.0.0/10` subnet. FQDN: `library.mesh.vimium.net`.
+