add README,stand-alone example

README.md

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+disko
+=====
+
+nix-powered automatic disk partitioning
+
+Usage
+=====
+
+Master Boot Record
+------------------
+This is how your iso configuation may look like
+
+```nix
+{ pkgs, ... }:
+let
+  disko = (builtins.fetchGit {
+    url = https://cgit.lassul.us/disko/;
+    rev = "88f56a0b644dd7bfa8438409bea5377adef6aef4";
+  }) + "/lib";
+  cfg = builtins.fromJSON ./tsp-disk.json;
+in {
+  imports = [
+    <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix>
+  ];
+  environment.systemPackages = with pkgs;[
+    (pkgs.writeScriptBin "tsp-create" (disko.mount cfg))
+    (pkgs.writeScriptBin "tsp-mount" (disko.mount cfg))
+  ];
+  # Optional: Automatically creates a service which runs at startup to perform the partitioning
+  systemd.services.install-to-hd = {
+    enable = true;
+    wantedBy = ["multi-user.target"];
+    after = ["getty@tty1.service" ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = [ (disko.create cfg) (disk.mount cfg) (];
+      StandardInput = "null";
+      StandardOutput = "journal+console";
+      StandardError = "inherit";
+    };
+  };
+}
+```
+tsp-disk.json (TODO: find the correct disk)
+```json
+{
+  "type": "devices",
+  "content": {
+    "sda": {
+      "type": "table",
+      "format": "msdos",
+      "partitions": [
+        { "type": "partition",
+          "start": "1M",
+          "end": "100%",
+          "bootable": true,
+          "content": {
+            "type": "filesystem",
+            "format": "ext4",
+            "mountpoint": "/"
+          }
+        }
+      ]
+    }
+  }
+}
+```
+
+GUID Partition Table, LVM and dm-crypt
+--------------------------------------
+See `examples/`

example/stand-alone/configuration.nix

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+{ pkgs, ... }:
+let
+  disko = (builtins.fetchGit {
+    url = https://cgit.lassul.us/disko/;
+    rev = "88f56a0b644dd7bfa8438409bea5377adef6aef4";
+  }) + "/lib";
+  cfg = builtins.fromJSON ./tsp-disk.json;
+in {
+  imports = [
+    (disko.config cfg)
+  ];
+  environment.systemPackages = with pkgs;[
+    (pkgs.writeScriptBin "tsp-create" (disko.create cfg))
+    (pkgs.writeScriptBin "tsp-mount" (disko.mount cfg))
+  ];
+}
+

example/stand-alone/tsp-disk.json

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+{
+  "type": "devices",
+  "content": {
+    "sda": {
+      "type": "table",
+      "format": "msdos",
+      "partitions": [
+        { "type": "partition",
+          "start": "1M",
+          "end": "100%",
+          "bootable": true,
+          "content": {
+            "type": "filesystem",
+            "format": "ext4",
+            "mountpoint": "/"
+          }
+        }
+      ]
+    }
+  }
+}
+