initial project setup

flake.nix

@@ -0,0 +1,31 @@
+{
+  description = "Essence Quebec - Gas price heatmap";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            go
+            gopls
+            gotools
+          ];
+        };
+
+        packages.default = pkgs.buildGoModule {
+          pname = "essence";
+          version = "0.1.0";
+          src = ./.;
+          vendorHash = null; # Will need updating after go mod tidy
+        };
+      }
+    );
+}