Update README.md, TeachingHub.md, Documentation/teachinghublogin.png,...

Update README.md, TeachingHub.md, Documentation/teachinghublogin.png, Documentation/teachinghubnotebooks.png, Documentation/teachinghubnotebooks_kernels.png, Documentation/techinghub-qrcode.png, Documentation/teachinghub-authenticator.png files

README.md

@@ -105,8 +105,9 @@ git/2.29.0-gcc-5.3.0         netcdf-fortran/4.5.3-gcc-5.3.0
 ```
 
 ### JupyterHub
-[Goto SRVX1-Jupyterhub](https://srvx1.img.univie.ac.at)
-[Instructions SRVX1-Teaching Hub](TeachingHub.md)
+Direct Access: [Goto SRVX1-Jupyterhub](https://srvx1.img.univie.ac.at)
+
+Follow the instructions to get access: [Instructions SRVX1-Teaching Hub](TeachingHub.md)
 
 ## Information on SRVX2 - Compute
 Computing Node @UZA2

TeachingHub.md

 # Teaching Hub @ IMGW
 
-Address: [Teaching Hub](https://srvx1.img.univie.ac.at)
-Access to the Teaching Hub can be done only via a browser.
-Access to SRVX1 via a terminal (Putty,...)
+<img src="https://jupyter.org/assets/hublogo.svg" width="300px">
+
+- Address: [Teaching Hub](https://srvx1.img.univie.ac.at)
+- Access to the Teaching Hub can be done only via a browser.
+- Access to SRVX1 via a terminal (Putty,...)
+
 
 [[_TOC_]]
 
 ## How to get access?
-Usually your teacher is going to sign you up and you will recieve one or two emails containing information on how to login.
+Usually **your teacher** is going to **sign you up** and you will recieve one or two emails containing information on how to login.
 You will recieve access to the Teaching Hub usually for 6 month. Can be extended for good reasons or until a teacher signs you up again.
 
-### You recieved two Emails
-This means you are new to the servers and the teaching hub.
+## You recieved two Emails
+This means you are new to the SERVERS and the Teaching Hub.
 
 The first email contains your login details for SRVX1, you get a username (Matrikelnumber) and a password. It looks like this:
 ```
@@ -34,8 +37,74 @@ Account expires: 2021-08-30
 ```
 Use these to login to the server and change the password to something better and still something that is safe:
 ```
-ssh [user]@srvx1.img.univie.ac.at
+$ ssh [user]@srvx1.img.univie.ac.at
+----------------------------------------------
+                _                                  
+              (`  ).                          
+             (     ).                     
+)           _( SRVX1 '`.                
+        .=(`(      .   )     .--       
+       ((    (..__.:'-'   .+(   )                   
+`.     `(       ) )       (   .  )     
+  )      ` __.:'   )     (   (   )) 
+)  )  ( )       --'       `- __.'   
+.-'  (_.'          .')              
+                  (_  )                       
+                              131.130.157.5          
+--..,___.--,--'`,---..-.--+--.,,-,,.-..-._.-.-
+----------------------------------------------
+Teaching Server @IMGW 
+Environmental Modules: module av
+Jupyterhub: https://srvx1.img.univie.ac.at
+Usage Profile: Students
+----------------------------------------------
+
+$ passwd 
+Changing password for user [user].
+Changing password for [user].
+(current) UNIX password: 
+```
+After you completed these steps you are free to login anytime and use the server. 
+The second email contains your Teaching Hub credentials. See below.
+
+## You recieved one Email
+the email you recieved contains credentials for the Teaching Hub. This email contains your username (the same as on SRVX1 for login), a new password (only for the Teaching Hub) and a secret (16 digit code). They look like this:
+```
+Dear TeachingHub User Monkey
+Some of your user information has been updated.
+ 
+TeachingHub Account Specification:
+servers: https://srvx1.img.univie.ac.at
+username: monkey
+password: ABCDEFGHIJK (signed in, click on user name, upper right corner)
+Email: a000000@univie.ac.at
+Secret: 1A2B3C4D5E6F7G8H
+
+Please note that the TeachingHub is open from the web. 
+Two-factor Authentication is required. Download one of these apps and use your secret to generate TOTP (Time based One Time Passwords).
+Authy (https://authy.com/download/)
+FreeOTP (https://freeotp.github.io/)
+Google Auth (https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2)
+...
 ```
+You need to download one of these apps:
+- [Authy](https://authy.com/download/)
+- [FreeOTP](https://freeotp.github.io/)
+- [Google Auth](https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2)
+- or any other (search `2fa apps` and you will find plenty)
+
+I recommend using your phone and an app there, as this is the most secure way. And with you phone you can scan the qr code, which looks like this:
+<img src="Documentation/teachinghub-qrcode.png" width="300px">
+
+When you scan to your Authenticator App, it will automatically get the details (username, Secret) required to generate every 30 seconds a Time-based One Time  Password (TOTP). Like this:
+![](Documentation/teachinghub-authenticator)
+
+The combination of username, password and TOTP needs to be used to sign in:
+![](Documentation/teachinghublogin)
+
+This sounds all really complicated, but I promise this will be easier from time to time. Don't forget that this for our all security and your contribution is appreciated! Thanks.
+
+