Added guide to add loading messages.

CONTRIBUTING.md

@@ -16,6 +16,8 @@ about the problem. We also set aside issues that are [good for new
 contributors](/../issues?label_name[]=good+first+issue). If you are
 looking for something to contribute, check out these issues.
 
+We also keep a list of [witty loading messages](/doc/loading.md) that make a great first contribution.
+
 ## Forking the Project
 
 Forking a project makes a copy of the project on your own GitLab

doc/loading.md

@@ -0,0 +1,26 @@
+# Loading Messages
+
+## Overview
+
+Flexblock uses (arguably) witty loading messages to not only improve the user experience while waiting for the page to load, but also because adding to these messages is easy, and makes a great first contribution! The conde changes to add a new loading message are extremely simple (you just need to add your new message to a list of strings), so that you can focus on the contributing process rather than complex code. This guide will walk you through the steps of adding a new loading message. This guide assumes you have read [CONTRIBUTING.md](CONTRIBUTING.md), and have created your own fork of flexblock. This guide only covers the changes in the code.
+
+## Adding a New Message
+
+The loading messages are stored in the file `src/clj/flexblock/views/loading.clj`. Inside there is a var definition that looks something like this:
+
+```clojure
+(def messages
+  ["A fun loading message!"
+   "Another fun loading message!"
+   ,,,])
+```
+
+You can add your loading message by simply adding it to the list. Make sure to keep the list in alphabetical order!
+
+```clojure
+(def messages
+  ["A fun loading message!"
+   "Another fun loading message!"
+   "My brand new super awesome loading message!"
+   ,,,])
+```