feature(git): add git home-manager module

modules/home-manager/git.nix

@@ -0,0 +1,18 @@
+{ config, pkgs, inputs, ... }:
+
+{
+  programs.git = {
+    enable = true;
+    settings = {
+      push = { autoSetupRemote = true; };
+      user = {
+        name  = "aaron";
+        email = "aaron@0x29a.ch";
+      };
+    };
+    signing = {
+      key = "7A830180A05DAC59CDE43B0677D2F5DB48184456";
+      signByDefault = true;
+    };
+  };
+}