GSoD 2020: Ignition Robotics on-boarding guide

@marya @claireyywang
I have worked upon your suggestions & made a preliminary structure for the guide.
Here is the LINK for the same.

@marya I have also prepared my initial project proposal in a formal document. I have mailed it to you on your osrf e-mail since I was not comfortable with putting it out in the community forum due to confidentiality of some of my previous work.