Adding flake.nix

README.md

···
 # mellon
-Modules for Elvish Shell
+## Speak, friend, and enter 
+
+Modules for [Elvish Shell](https://github.com/elves/elvish)
+
+# Install
+
+```elvish
+use epm
+epm:install &silent-if-installed=$true github.com/ejrichards/mellon
+
+```
+
+## NixOS
+
+`/etc/nixos/flake.nix`
+```nix
+{
+  inputs = {
+    mellon.url = "github:ejrichards/mellon";
+  };
+  outputs = {
+    mellon,
+    ...
+  }:
+  {
+    ...
+    nixosConfigurations = {
+      modules = [
+        mellon.nixosModules.default
+      ];
+    };
+}
+```
+
+# Usage
+
+TODO

flake.nix

···
+{
+  outputs = _: {
+    nixosModules.default = _: {
+      environment.etc."mellon/elvish/lib/github.com/ejrichards/mellon/fzf.elv".source = ./fzf.elv;
+
+      environment.variables = {
+        XDG_DATA_DIRS = "/etc/mellon";
+      };
+    };
+  };
+}