Update readme (#19)

* Refactored README
Added Introduction
Added Overview
Standardized Initiator/Operator naming convention
Refactored Flow description
Moved Security Notes to the bottom
Added Table of Contents

* Improved notes on running commands with YAML files

* Changed command arguments explanation to a table

* Added Docker commands

* Added default values to parameters explanation
Added entire public keys
Added explanation about operator info file

* Integrated suggestions from Pull Request review

* Refactored README with insights from meeting
Added latest changes and parameters

* Added new config params to YAML section

* Added missing links

* Fixed wrong internal link

* Acted on requested changes in the PR Review

* Added operatorsInfo option in other two sections