Add examples of iteration patterns for primitive Interval to reference guide

[donraab]

The new reference guide is now in Asciidoc. The relevant section is now here: https://github.com/eclipse/eclipse-collections/blob/master/docs/2-Collection_Containers.adoc#intinterval

Use the Lost and Found Kata as a guide for the iteration patterns that can be included for various primitive types.

https://github.com/eclipse/eclipse-collections-kata/tree/master/lost-and-found-kata

[sandip1805]

Hi @donraab , I would like to work on this, can you please assign this to me?

[donraab]

Hi @sandip1805 , thanks for volunteering! I've assigned it to you.