Add README.md

containing very simple introductions

README.md

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+nix library extension, containing sophisticated script and code generator functions.
+
+# How to include as overlay
+
+```
+{ config, pkgs, ... }:
+let
+
+  # fetch the repository
+  # ------------------
+  # nix-prefetch-git is your friend to create this part.
+  nix-writers = (import <nixpkgs> {}).fetchgit {
+    url    = "https://cgit.krebsco.de/nix-writers";
+    rev    = "c8d71ce6acbae124a7bc162323442979a1d6df06";
+    sha256 = "0r1p34a3jvm55v5sbkfbjpqcld2cbdrvc5685g723b1frhw666ag";
+  };
+
+in {
+
+  # include the repository as overlay
+  nixpkgs.config.packageOverrides = import "${nix-writers}/pkgs" pkgs;
+
+  ...
+
+}
+```
+
+# How to use the scripts
+
+once you've included the nix-writers as overlay you can use the scripts to create to create binaries (for example)
+
+```
+  environment.systemPackages = with pkgs; [
+
+    # Haskell example
+    (writeHaskell "nix-writers-example-haskell" {
+      executables."nix-writers-example-haskell".text = ''main = print "this is a writeHaskell example"'';
+    })
+
+    # C example
+    (writeC "nix-writers-example-c" {
+      destination = "/bin/nix-writers-example-c";
+    } ''int main() { printf("this is a writeC example!\n"); }'')
+
+    # Dash example
+    (writeDashBin "nix-writers-example-dash" ''echo "this is a writeDash example!"'')
+
+  ];
+```