Create index.md with introductory text and headers

Added introductory content and headers to index.md

Author: evoperator

index.md

@@ -0,0 +1,9 @@
+# Introduction
+
+### Second smaller introduction
+
+##### Third smaller header
+
+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.