Create GSC20 meeting page

[only1chunts]

Aim
To create the GSC20 page in the new website

The meeting age is currently on the GSC website here:
https://press3.mcs.anl.gov/gensc/meetings/gsc20/

The content of that needs converting to MD and uploading to this GitHub repo as "GSC20.md" here: https://github.com/GenomicsStandardsConsortium/gensc.github.io/tree/master/pages/meetings

For guide on creating markdown files from html see readme.md

Any images used need to be saved here https://github.com/GenomicsStandardsConsortium/gensc.github.io/tree/master/images/
NB- sponsors images may already exist if used in other pages already.

Any additional files e.g. PDF version of agenda or schedule, powerpoint slides etc. need to be saved here:
https://github.com/GenomicsStandardsConsortium/gensc.github.io/tree/master/other-media/
NB- Be aware of the need for unique file names here, e.g. "agenda.pdf" is not likely to be unique! consider adding prefix of "gsc20-meeting" to all files to be associated with this meeting page.

Extra content
Where possible any augmentation of the page with media files from currently unlinked sources (e.g. youtube, images, slideshows etc) is strongly encouraged.