Add contributing section

assets/README.md

@@ -1,7 +1,7 @@
 # Table of contents
 
 * [JS MythBusters_](/README.md)
-	* [Send your tip!](/send-tip.md)
+        * [Send your tip!](/contributing.md)
 	* [Bibliography](/bibliography.md)
 	* [Resources](/resources.md)
 

assets/scss/_markdown.scss

@@ -453,7 +453,7 @@ html .markdown-body table th {
   font-size: x-large;
 }
 
-a.link.title.link-send-tip {
+a.link.title.link-contributing {
   color: $special-text-color !important;
 }
 

contributing.md

@@ -0,0 +1,12 @@
+# Send your tip!
+
+For submit a tip, do a PR in our [GitHub repository](https://github.com/Kikobeats/js-mythbusters).
+
+Before add your tip take in consideration the following guidelines:
+
+- Add your tip in the correct section. Each different section is a folder (for example [v8-tips](https://github.com/Kikobeats/js-mythbusters/tree/master/v8-tips) or [workflow](https://github.com/Kikobeats/js-mythbusters/tree/master/workflow)).
+- Inside the folder, each file is a tip.
+- If your tip is very similar to a tip that already exists, consider extend the first tip.
+- Don't add more than one tip per file.
+- The text that describe the tip have to be concesive and precise.
+- For avoid extend the tip, you can reference other tips of the site.