home manager: git: add username and email

home/emmatherock/git.nix

@@ -1,3 +1,9 @@
 {
-  programs.git.enable = true;
+  programs.git = {
+    enable = true;
+    settings.user = {
+      name = "emmatherock";
+      email = "emanuelxoda@gmail.com";
+    };
+  };
 }