nix: init default builder directory

.envrc

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+NIX_PATH=$NIX_PATH:nom=$(pwd)/nix

nix/README.md

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+# nix builders
+
+The kookienomicon is a collection of projects, each with their own
+dependencies, and build setups.  Nix and Lorri are used extentsively
+to facilitate switching between build tools and dependency scopes.
+
+The root of the repository adds a new key to the `NIX_PATH`
+environment variable, which can then be used to look-up development
+builders.
+
+
+## How to use
+
+There are default builders for common programming language setups
+(such as Rust).
+
+```nix
+
+```

nix/default.nix

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+/** 
+ * Kookienomicon overlay definition 
+ *
+ * 
+ *
+ */
+
+self: super: {
+  
+}

nix/rust.nix

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+with import <nixpkgs> {};
+
+stdenv.mkDerivation {
+  name = "rust-devel";
+  buildInputs = with pkgs; [
+    rust-analyzer rustc
+    cargo-watch
+    clangStdenv
+    hello
+  ];
+}