Add a guide for installing Gajim (XMPP Client) on Tails

Add a guide Similiar to that of the Dino Guide.

(Unlike Dino, Gajim Does not crash with Tor)

https://t-hinrichs.net/DinoTails/DinoTails_recent.html

Have successfully installed Gajim and setting via dotfile but is a pain considering kwallet.

Suggested guide should be something like this:

echo -e '/home/amnesia/.config/gajim source=gajim' | sudo tee -a /live/persistence/TailsData_unlocked/persistence.conf > /dev/null

echo -e '/home/amnesia/.local/share/gajim source=gajim' | sudo tee -a /live/persistence/TailsData_unlocked/persistence.conf > /dev/null

(this Should only be used if user wants chat logs persistently cached to disk, most users probaly should skip this part)

echo -e '/home/amnesia/.cache/gajim source=gajim' | sudo tee -a /live/persistence/TailsData_unlocked/persistence.conf > /dev/null

The part I am unsure about is the source for kwalletd?

(kwalletd is required to save sign in credentials for xmpp)

echo -e '/home/amnesia/.local/share/kwalletd source= | sudo tee -a /live/persistence/TailsData_unlocked/persistence.conf > /dev/null

Would the source= for kawalletd be libkwalletbackend5-5?

Next shut down tails and reboot with admin password set again

sudo apt install gajim gajim-omemo -y

Before signing into Gajim, open gajim and change global proxy setting to Tor preset

Then sign into account (if your xmpp server hast a Tor hostname select advanced and select Tor proxy and set your hostname acordanly)

Then after you sign in under "Modify Account" and under Privacy toggle off the following settings:

- Idle Time
- Local System Time
- Client/Operating System

- Send Chatstae [Disabled]
- Send Chatstate in Group Chats [Disabled]

Lastly Go to Accounts Tab and select Adavanced and Archiving Preferences and select Contacts only or Never.