Create README.md

README.md

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+# University PC NixOS config
+
+The repo here is located **originally** on my personal [Greg's
+Forgejo](https://forgejo.gregorbednov.ru/gregorbednov/configuration.nix).
+
+It was used as a ready-to-go declarative installation of all required software
+in Industrial Informatics Department in MIREA. So feel free to fork it and
+modify it.
+
+## Architecture
+
+### Context and requirements
+
+I worked on the config in university department with its own student PC machines
+fleet, about from 50 to 70 machines.
+
+- from 50 to 70 machines needed to install Linux for student work and a bunch of
+  cross-platform apps (by the way most of PCs were on Ubuntu 20.04 and Ubuntu
+  22.04, each with unique history and packages set. And I installed NixOS on
+  each).
+
+- non-NixOS (Debian) Server - able to host files, unable to switch fully on
+  NixOS using [nixos-infect](https://github.com/elitak/nixos-infect) or
+  something. It listens on `10.0.174.12` in my personal case;
+
+- me and my collegues couldn't operate on network routers and DNS servers,
+  because it's not our competence (only central networking and security
+  operating team could set up our routers and domain resolving, and would leave
+  no exceptions without special cases in prior to security)
+
+- and on the other hand, students were already allowed to unplug Ethernet cables
+  from PC and to plug it into their own laptops; as my collegues said, that's
+  why none of them don't want to support (pseudo)static IPv4. and also, students
+  in tech when something doesn't work properly *for them*, are trying to hack it
+  --- so, may be we would get fake static IPs issues.
+
+- students vandals some settings sometimes, however it would be nice if they had
+  customization options
+
+### Description and solutions
+
+- Debian server `10.0.174.12` --- Yggdrasil Peer and Fileserver
+  - NixOS builds `nixos.builds.node` virtual machine on it --- doesn't have
+    static IP but has well-known static Yggdrasil IPv6
+- 50-70x NixOSxWindows dual-boot PCs with
+  - dynamic IPv4
+  - static Yggdrasil-overlayed IPv6
+  - configuration.nix and flake.nix in /etc/nixos,
+  - all of hardware specifics is left in hardware-configuration.nix
+  - any time student user can be reset completely with `resethome` command