Add hub command

pages/common/hub.md

@@ -0,0 +1,16 @@
+# hub
+
+> A command-line wrapper for git that makes you better at GitHub.
+> The commands can also be used using "git" instead of "hub".
+
+- Clone a repository you own:
+
+`hub clone {{ repo_name }}`
+
+- Clone another user repository:
+
+`hub clone {{ github_username }}/{{ repo_name }}`
+
+- Open the current project's issues page:
+
+`hub browse -- issues`