Add founder information

Codecov Report

Patch coverage is 34.21% of modified lines.

Files Changed	Coverage
alumnirekisteri/rekisteri/forms.py	`ø`
alumnirekisteri/rekisteri/views.py	`15.15%`
alumnirekisteri/rekisteri/views_api.py	`38.88%`
alumnirekisteri/rekisteri/models.py	`100.00%`
alumnirekisteri/rekisteri/urls.py	`100.00%`
prodekoorg/settings/base.py	`100.00%`

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