fixed bug (V, I not defined)

Update README.md

Merge pull request #158 from MaximeBaudette/ApplicationExamples

Application examples

Revert "Adding iPSL Tutorial to the repo."

This reverts commit 6ef17aa.

Update of the Readme

@lvanfretti Please let me know if you don't like it how I did it

Update README.md

Introduced some clarifications given feedback from different people.