Add password Login section

Manual.md

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 **This is WIP!**
 
 **Table of Contents**
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 # Basics
 ## Before being logged in
 ### How do I log in with username and password?
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+To login using your username, you first have to open the Application.
+You will get greeted by a server field, a button named “Log in” or the translation of that according to your system language.
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+<img height="300px" target="_blank" src="uploads/68ed3f7c33b7c290e457d37e249266e3/image.png">
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+(Click image to see in full)
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+Now you have 2 choices. Do you know your server address? Then go ahead and put it into the top field before you continue.
+If you only have a username and password, continue clicking the button.
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+From there, please fill the 2 fields and click log in. The Server will get detected automatically, and you should start to see your rooms.
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 ### How do I log in with SSO (For example Mozilla or Element One)?
 ## In the Room list
 ### How do I start a new room?