Create Installation Guide

Installation-Guide.md

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+- Run this command to ensure Git is installed:
+
+```
+nix-shell -p git vim 
+```
+
+- Clone this repo & enter it:
+
+```
+git clone https://gitlab.com/zaney/zaneyos.git
+cd zaneyos
+```
+
+- *You should stay in this folder for the rest of the install*
+- Change any options in options.nix as needed.
+- Generate your hardware.nix like so:
+
+```
+nixos-generate-config --show-hardware-config > hardware.nix
+```
+
+- Run this to enable flakes and install the flake:
+
+```
+NIX_CONFIG="experimental-features = nix-command flakes" 
+sudo nixos-rebuild switch --flake .#thehostnameyousetinoptions.nix
+```
+
+### You Are Done!