Create Membership Model

[Mariatta]

Create user membership Model

• name
• email
• social media urls: linkedin, mastodon, twitter (optional)
• bio: markdown (optional)
• avatar: (optional)
• pronouns (optional)
• location (?)
• List of projects. (optional for now)
• GitHub handle: connect with GitHub API.
• confirmed status: whether email address is confirmed
• approval status: whether approved by us. (True false)
• approved by: the username of the admin who approved