add flake/home-manager and standard cli programs

modules/home-manager.nix

@@ -0,0 +1,17 @@
+{
+  home-manager = {
+    useGlobalPkgs = true;
+    useUserPackages = true;
+
+    sharedModules = [{
+      home.stateVersion = "23.05";
+    }];
+    
+    users = {
+      stefan = {
+        home.username = "stefan";
+        home.homeDirectory = "/home/stefan";
+      };
+    };
+  };
+}