Add documentation for Flakes

[sevanspowell]

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• Add some beginning resources for understanding Nix Flakes.

[JBlaze2029]

I do not want this service and did Not apply for it

On Fri, 22 Apr 2022, 7:42 am Yura Lazarev, @.***> wrote:

@.**** commented on this pull request.

In docs/code/Flakes/Tutorials/Installation.md https://github.com/input-output-hk/adrestia/pull/23#discussion_r856148245 :

@@ -0,0 +1,40 @@

+---

+title: 01-Installation

+date: 2021-02-09

+---

+Presuming nix is already installed, Nix flakes are available from Nix version 2.4 and up.

+## Non-NixOS

+```

+$ nix-env -iA nixpkgs.nixUnstable # or nixpkgs.nix_2_4

Doesn't work on NixOS

 nix upgrade-nix

error: Nix on NixOS must be upgraded via 'nixos-rebuild'

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