new nixos dotfile layout

Signed-off-by: Michał Czyż <mike@c2yz.com>

home/programs/git.nix

@@ -0,0 +1,13 @@
+{
+  programs.git = {
+    enable = true;
+
+    userName = "Michał Czyż";
+    userEmail = "mike@c2yz.com";
+
+    extraConfig = {
+      init.defaultBranch = "main";
+      push.autoSetupRemote = true;
+    };
+  };
+}