Add a guide section for resource links

guide/resources.md

@@ -0,0 +1,17 @@
+Resources
+=========
+
+Frameworks
+----------
+
+ *  Please send a pull request!
+
+Helper libraries
+----------------
+
+ *  Please send a pull request!
+
+Articles
+--------
+
+ *  Please send a pull request!

guide/toc.md

@@ -58,3 +58,7 @@ Cowboy User Guide
    *  One process for many requests
    *  Lowercase header names
    *  Improving performance
+ *  [Resources](resources.md)
+   *  Frameworks
+   *  Helper libraries
+   *  Articles