Updating main file with ACME information

main_file.txt was missing information about my opinion of ACME
branch-naming convention.  This has been updated.
Adding Changelog

Adding author and date information.
Merge remote branch 'origin/matthewhoffman/mpas_li/fixing_notes' into jeremyfyke/mpasi/subgrid

Yup, merged.
* origin/matthewhoffman/mpas_li/fixing_notes:
  Adding Changelog
  Updating main file with ACME information

Conflicts:
	Changelog
	main_file.txt