Create flake

flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "A Rust program to create and update a Spotify playlist of your recent top played tracks";
+
+  inputs = {
+    nixpkgs.url      = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url  = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+
+        buildPkgs = with pkgs; [
+          (rust-bin.selectLatestNightlyWith (toolchain: toolchain.default))
+        ];
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = buildPkgs;
+        };
+      }
+    );
+}