feat: Flake | add dev shell

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -0,0 +1 @@
+.direnv

flake.nix

@@ -75,5 +75,13 @@
         modules = [ ./home-manager/home.nix ];
       };
     };
+
+    devShell.x86_64-linux = pkgs.mkShell {
+      buildInputs = with pkgs; [
+        # Adding node for copilot
+        nodejs_20
+        nil
+      ];
+    };
   };
 }