Add shell.nix and README

README.md

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+WIP
+
+# Building
+
+Simply run `cargo build --release` from the repository root. For missing dependencies, see instructions below.
+
+## Archlinux
+
+`pacman -Sy libadwaita`
+
+## Nix
+
+If you are on old distro but have nix, just do `nix-shell` from repository root. It will open shell with all dependencies for build.

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    buildInputs = with pkgs.buildPackages; [ libadwaita ];
+    nativeBuildInputs =  with pkgs; [ pkg-config ];
+}