Add Gmsh

[tkoyama010]

Project name:

Project website/repository:

License:

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Checklist for all pull requests:

• Project is certified awesome

• The project is open-source and accessible.
• Searched the existing entries to make sure this is not a duplicate.
• Contains only a single addition (make separate PRs if adding more than one).
• Added the link to the bottom of the relevant category.
• Created a new category only if necessary.

• Add icon from the media/icon/ folder if applicable (e.g., ![Python](media/icon/python.png) ).
• Checked spelling and grammar.
• Removed trailing whitespace and periods.
• Confirm the dash – is not a minus -.
• Used title-casing (AP style) for project name.

Checklist for new software projects:

• Link the code repository rather than the website/documentation
• Installation instructions present
• Documentation looks great
• Examples or Tutorials to follow
• Tests and Travis CI running

Checklist for new Data Repositories, Tutorials and Cheat Sheets, and Miscellaneous:

• Easily accessible
• Comprehensive and widely appealing