README: add details on default plan that the launcher creates

Author: uakfdotb

README.md

@@ -1,7 +1,11 @@
 Launch Gogs on LunaNode
 -----------------------
 
-To get started with Gogs on LunaNode, just head to https://launchgogs.lunanode.com
+To get started with Gogs on [LunaNode](https://www.lunanode.com), just head to
+https://launchgogs.lunanode.com
 
 The code for the launcher is in this repository. The launcher will setup a Gogs
 installation with HTTPS. The git SSH port will be on non-standard 10022.
+
+By default, the launcher will create a m.1s instance with 1 GB RAM, which costs
+$3.50/mo ($0.00486/hr).