Add newsletter composer + Sendy API

[NicoJuicy]

Add a newsletter composer to send to the clients based on Zurb Email Framework

Amazon SES or Sendy?

• [ ] Connect with Amazon SES
• [ ] Handles bounces, complaints & deliveries
• Add a periodicle rotation ( daily, weekly, ..), users can unsubscribe
• Auto send of their subscribed tags

2 types of newsletters:

• Handpick the items to send and send them to all emails ( that are subscribed) or add a manual email list
• Auto send the latest additions, based on their chosen tags

[NicoJuicy]

Considering to use https://sendy.co/api which has an c# API : https://github.com/timbjames/Sendy.Net

Then only the layout is created. And everything else is handled by Sendy + Users can selfhost it

[NicoJuicy]

Current status: Almost recreated the Sendy Api with dotnet Core support ( couldn't use Sendy.Net ). There isn't a very clean error handling though, but i'll do this later.

• Subscribe
• Unsubscribe
• Subscription Count
• Subscription Status
• Create Campaign and send

Will publish later on Github when completed, currently a private gitlab repo ;)

[NicoJuicy]

Added c# Sendy api here