Add Fortitude60

[mcp292]

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Please complete this checklist and submit your issue - I will do my best to add your keyboard as soon as I can:

• [x] Keyboard name: Fortitude60
• [ ] Url to vector graphic (e.g. svg, pdf, etc.) of switch plate: https://github.com/Pekaso/fortitude60/blob/master/fortitude60_plate_v1.0.zip (not sure if this is correct)
• [x] Min and max number of keys: 60 max, not sure about min
• [x] Url to keyboard project source (if available): https://github.com/Pekaso/fortitude60/
• [ ] Url to store to buy keyboard (if available): Still looking...