Add image to index.md introduction

Added an image to enhance the introduction section.

Author: evoperator

index.md

@@ -7,3 +7,5 @@
 This is a meaningful commit message and it means this commit is meaningful.
 I added some text to this pre-made file to practice markdown.
 (In a real scenario) `index.md` file was made to introduce a description that has just been added to explain a concept in this repo.
+
+![Adventure Time!](https://octodex.github.com/images/adventure-cat.png)