Added image TeapotIn3Dviewport.png for Wiki

Working on the getting started Wiki, can't link to an image unless its
in the repository.
Added name and email to contributors

Updated contributors list with name and email
Merge pull request #3 from helix-toolkit/master

Merge pull request #80 from johnsonlu/master
Do not raise ModelsSelectedByRectangleEventArgs when the rectangle is zero.
Can use point to clear existing selection.
Merge pull request #81 from dgwaldo/master

Added .png file to images for getting started wiki
Merge pull request #84 from johnsonlu/master

Do not raise ModelsSelectionByRectangleEventArgs when the size of rectangle is zero