add git config

.gitconfig

@@ -0,0 +1,17 @@
+# This is Git's per-user configuration file.
+[user]
+# Please adapt and uncomment the following lines:
+  name = Jay
+	email = jay@rtj.tw
+[diff]
+	tool = vimdiff
+[difftool]
+	prompt = false
+[alias]
+	d = difftool
+	co = checkout
+	ci = commit
+	l = log --oneline --graph --all
+	ls = log --graph --pretty=format:\"%h <%an> %ar %s\" --all
+	st = status
+	br = branch