re-org and add readme

README.MD

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+# Roy's NixOS Homelab Config

nixos/flake.nix

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+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: {
+
+    packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;
+
+    packages.x86_64-linux.default = self.packages.x86_64-linux.hello;
+
+  };
+}

nixos/hardware-configuration.nix

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+throw "Have you forgotten to run nixos-anywhere with `--generate-hardware-config nixos-generate-config ./hardware-configuration.nix`?"