Add system configuration documentation

README.md

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+██   ██ ███████ ███████ ███████ ██ ██  ██ ██   ███
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+██   ██ ██   ██      ██ ██   ██ ██  ██ ██ ██  ██ ██
- | |__| | (_| \__ \ | | | |__| | (_) | |_\__ \
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 ```
 
-My personal configuration for NixOS/home-manager.
+A very opinionated (technically only for me) configuration that allows easy adding and removing of systems alongside custom configurations for each system.
-While not intended to be used by someone else, feel free to do so anyway or use it as a template for your configuration if you wish to.
+
+# Usage
+
+This flake is intended to be used as an input to your own NixOS configuration:
+
+```nix
+dashNix = {
+  url = "github:DashieTM/dotFiles";
+  inputs = {
+    # ensure these are here to update the packages on your own
+    nixpkgs.follows = "nixpkgs";
+    stable.follows = "stable";
+  };
+};
+```
+
+You can then configure your systems in your flake outputs with a provided library command:
+
+```nix
+nixosConfigurations = (inputs.dashNix.dashNixLib.build_systems [
+  "system1"
+  "system2"
+  "system3"
+] ./.);
+```
+
+In order for your configuration to work, you are required to at least provide a single config file with a further config file being optional for custom configuration.
+
+|- flake.nix\
+|- flake.lock\
+|- system1/\
+|---- system1.nix (required)\
+|---- configuration.nix (optional)\
+|- system2/\
+|---- system2.nix (required)\
+|---- configuration.nix (optional)\
+|- system3/\
+|---- system3.nix (required)\
+|---- configuration.nix (optional)
+
+Here is a minimal required configuration (the TODOs mention a required change):
+```nix
+{
+  # variables for system
+  conf = {
+    # TODO change this to your monitor and your pc name
+    monitor = "YOURMONITOR";
+    hostname = "YOURNAME";
+    # TODO only needed when you use intel -> amd is default
+    # cpu = "intel";
+  };
+  # modules
+  mods = {
+    sops.enable = false;
+    nextcloud.enable = false;
+    hyprland.monitor = [
+      # default
+      # TODO change this to your resolution
+      "DP-1,1920x1080@144,0x0,1"
+      # all others
+      ",highrr,auto,1"
+    ];
+    # or amd, whatever you have
+    nvidia.enable = true;
+    kde_connect.enable = true;
+    # TODO change this to your main resolution
+    # -> this will be your login manager
+    greetd = { resolution = "3440x1440@180"; };
+  };
+}
+```
 
 # Modules