update to youtube video url of challenge video output

adding output images

fix to car position calculation in plot_lanes

First commit

add note on writing video frames

Update writeup_template.md

Add files via upload

Update writeup_template.md

Update writeup_template.md

Update writeup_template.md

Update writeup_template.md

change rubric items from questions to statements

replace images

need to replace image

need to replace image