[Patch] Created new section for index.rst (sphinx); How To's in "introduction"

[Erick Santiago]

Hi Team,  A new section was created in index.rst (under hermes/doc$) called "How To's (Using certain Applications)", and the first sub-section "How to use ParaView" was added.  More "How To's" will be added under this umbrella.  You could view or pull the work from my github at: https://erick-a...@github.com/erick-at-github/hermes.git g...@github.com:erick-at-github/hermes.git branch: sphinx Thanks, Erick