Update readme and screenshot

Signed-off-by: Joas Schilling <coding@schilljs.com>

README.md

@@ -3,28 +3,24 @@
 # Registration
 This app allows users to register a new account.
 
+![Registration form](https://raw.githubusercontent.com/nextcloud/registration/master/appinfo/screenshot.png)
 
-# Requirements
-1. Nextcloud 17+
+# Install from appstore
 
-Supports SQLite, MySQL/MariaDB and PostgreSQL.
-
-# Install
-## Nextcloud AppStore
 From your Nextcloud instance, click: your profile to the upper right -> Apps -> Tools (in the left column), find Registration, click Enable
 
 # Features
 
-- Admin can specify which group the newly created users belong
-- Admin can limit the email domains allowed to register
-- Admin will be notified by email for new user creation
+- Admins can specify which group the newly created users belong to.
+- Admins can limit the email domains allowed to register.
+- Admins will be notified via email for new user creation
 
 # Web form registration flow
 
-1. User enters his/her email
+1. User enters their email address
 2. Verification link is sent to the email address
 3. User clicks on the verification link
-4. User is lead to a form where one can choose username and password
+4. User is lead to a form where they can choose their username and password
 5. New account is created and is logged in automatically
 
 # OCS API registration flow
@@ -33,14 +29,16 @@ See https://gist.github.com/juliushaertl/5a1d1132e7370b5ad38fbd6da3cae5b8
 
 # Donate
 
-Send Ethereum to `0x941613eBB948C2C547cb957B55fEB2609fa6Fe66`
-Send BTC to `33pStaSaf4sDUA8XBAHTq7ZDQpCVFQArxQ`
+You can donate to Pellaeon the original author of the app:
+
+* Send Ethereum to `0x941613eBB948C2C547cb957B55fEB2609fa6Fe66`
+* Send BTC to `33pStaSaf4sDUA8XBAHTq7ZDQpCVFQArxQ`
 
 # FAQ
 
 **Q: A problem occurred sending email, please contact your administrator.**
 
-A: your Nextcloud mail configurations or your mail server is incorrectly configured, please refer to the [Nextcloud documentation](https://docs.nextcloud.com/server/11/admin_manual/configuration_server/email_configuration.html).
+A: your Nextcloud mail configurations or your mail server is incorrectly configured, please refer to the [Nextcloud documentation](https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/email_configuration.html).
 
 # Testing