doc: add section for cataclysm-dda

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diff --git a/pkgs/games/cataclysm-dda/README.md b/pkgs/games/cataclysm-dda/README.md
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-# Cataclysm: Dark Days Ahead
-
-## How to install Cataclysm DDA
-
-To install the latest stable release of Cataclysm DDA to your profile, execute
-`nix-env -f "<nixpkgs>" -iA cataclysm-dda`. For the curses build (build
-without tiles), install `cataclysmDDA.stable.curses`. Note: `cataclysm-dda` is
-an alias to `cataclysmDDA.stable.tiles`.
-
-If you like access to a development build of your favorite git revision,
-override `cataclysm-dda-git` (or `cataclysmDDA.git.curses` if you like curses
-build):
-
-```nix
-cataclysm-dda-git.override {
-  version = "YYYY-MM-DD";
-  rev = "YOUR_FAVORITE_REVISION";
-  sha256 = "CHECKSUM_OF_THE_REVISION";
-}
-```
-
-The sha256 checksum can be obtained by
-
-```sh
-nix-prefetch-url --unpack "https://github.com/CleverRaven/Cataclysm-DDA/archive/${YOUR_FAVORITE_REVISION}.tar.gz"
-```
-
-The default configuration directory is `~/.cataclysm-dda`. If you prefer
-`$XDG_CONFIG_HOME/cataclysm-dda`, override the derivation:
-
-```nix
-cataclysm-dda.override {
-  useXdgDir = true;
-}
-```
-
-## Customizing with mods
-
-To install Cataclysm DDA with mods of your choice, you can use `withMods`
-attribute:
-
-```nix
-cataclysm-dda.withMods (mods: with mods; [
-  tileset.UndeadPeople
-])
-```
-
-All mods, soundpacks, and tilesets available in nixpkgs are found in
-`cataclysmDDA.pkgs`.
-
-Here is an example to modify existing mods and/or add more mods not available
-in nixpkgs:
-
-```nix
-let
-  customMods = self: super: lib.recursiveUpdate super {
-    # Modify existing mod
-    tileset.UndeadPeople = super.tileset.UndeadPeople.overrideAttrs (old: {
-      # If you like to apply a patch to the tileset for example
-      patches = [ ./path/to/your.patch ];
-    });
-
-    # Add another mod
-    mod.Awesome = cataclysmDDA.buildMod {
-      modName = "Awesome";
-      version = "0.x";
-      src = fetchFromGitHub {
-        owner = "Someone";
-        repo = "AwesomeMod";
-        rev = "...";
-        sha256 = "...";
-      };
-      # Path to be installed in the unpacked source (default: ".")
-      modRoot = "contents/under/this/path/will/be/installed";
-    };
-
-    # Add another soundpack
-    soundpack.Fantastic = cataclysmDDA.buildSoundPack {
-      # ditto
-    };
-
-    # Add another tileset
-    tileset.SuperDuper = cataclysmDDA.buildTileSet {
-      # ditto
-    };
-  };
-in
-cataclysm-dda.withMods (mods: with mods.extend customMods; [
-  tileset.UndeadPeople
-  mod.Awesome
-  soundpack.Fantastic
-  tileset.SuperDuper
-])
-```