Updated installation instructions

To clarify for #71

README.md

@@ -11,9 +11,18 @@ of all the available scripts.
 
 ## Installing
 
-Once you have Hubot installed, you can drop new scripts from this repository
-right into your generated Hubot installation. Just put them in `scripts`, add
-the new scripts to the `hubot-scripts.json` file.
+Once you have Hubot installed, you should already have `hubot-scripts` installed.
+Check `package.json` to be sure. If that is the case, you update `hubot-scripts.json`
+to list any scripts from this repository you want to load. The default
+`hubot-scripts.json` looks like:
+
+    ["redis-brain.coffee", "tweet.coffee", "shipit.coffee"]
+
+If you update `hubot-scripts` in `package.json`, you will automatically get updates to your scripts listed here.
+
+Alternatively, you can copy files from this repository into your `scripts` directory.
+Note that you would not get updates from the `hubot-scripts` repository unless you
+copy them yourself.
 
 Any third-party dependencies for scripts need the addition of your `package.json`
 otherwise a lot of errors will be thrown during the start up of your hubot. You