Dear [donor],
Thank you for your generous contribution of [amount] to Open Institute on [date] that provides us essential funding for the development a open-source mobile app for Open Institute.
Through your generosity, we are able to continue advancing the purpose of Open Institute, as a platform and launchpad serving to create more accountability and transparency in the world of fundraising for non-profit initiatives.
This email is serving as a 501(c)(3) tax-compliant donation receipt, for your records, and declaring that no goods or services were provided by the not-for-profit organization in return for the contribution. EIN (US-tax #): 82-1707895.
The About Us looks decent enough to me. From what I understand, there is a "Donate" button still missing to be implemented, but apart from that, I would say is ready to be used.