Merge branch 'krille/howtofork' into 'main'

docs: Add howtofork.md

See merge request famedly/fluffychat!351

HOWTOFORK.md

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+# How to create your own FluffyChat fork
+
+## 1. License
+FluffyChat is licensed under AGPL. Read the license
+(https://gitlab.com/ChristianPauly/fluffychat-flutter/-/blob/main/LICENSE) and 
+make sure that your fork is open source under the same license and that you
+fulfill all requirements. Otherwise you could end up in legal problems. We
+recommend you to contact a lawyer **before** you publish your fork!
+
+## 2. Disable end-to-end encryption!
+Due to US export regulations you are not allowed to publish your app in
+a store or anywhere on a US server before you have removed everything regarding
+the encryption. This means you have to remove:
+
+* Olm/Megolm end-to-end encryption
+* The sqlcipher database encryption
+* File encryption
+
+If you need help from us with using E2EE in your fork read more below under the 
+topic "**Official Support and Pricing**".
+
+## 3. Stay up to date!
+FluffyChat contains security related stuff. If we find a security bug, we will
+try to fix it as soon as possible and ship it with a new version. But this
+means that your fork is out of date and a security risk. You can't be awake
+24 hours a day so you must decide how you protect your users by chosing one
+of the following methods:
+
+1. Make your fork as minimal as possible and enable repository mirroring. Set
+up a CI which publishes new versions automatically if FluffyChat publishes a
+bug fix.
+2. Never sleep and pay a big team where one guy at least is never sleeping.
+3. Contact [famedly.com](https://famedly.com) to buy official support.
+
+## 4. Official Support and Pricing
+FluffyChat is free as in free speech and not free beer! Please contact
+my company [famedly.com](https://famedly.com) for offers and official support
+and take in mind that it costs a lot of work and time to maintain FluffyChat
+or the Famedly Matrix SDK. So we can't give you support for free. So please
+expect around 1$ per month per user of your fork.