ADD Solution to README: APT becomes unresponsive on the "proxmox-ve" package installation

[iPaulTech]

I had problems with the installation of the proxmox-ve package using the APT task.

After I added the following code section to the ansible.cfg file, the role ran successfully several times.

[ssh_connection]
ssh_args = -o ServerAliveInterval=20

I would therefore recommend including this section in the README, as I had to debug for about 2 weeks before I could finally narrow down the problem.

[lae]

There's got to be something peculiar about your environment (in comparison to the several other admins that use this role) that necessitates this. Maybe a non-standard /etc/ssh/sshd_config on the hosts? Either way, it wouldn't hurt to suggest setting this in the docs.

I would add a Troubleshooting section in the README between the Non-default scenarios and Developer Notes, and use similar formatting to the Non-default scenarios section for this. Do you think you could write a snippet/open a PR for this?

[iPaulTech]

Maybe a non-standard /etc/ssh/sshd_config on the hosts?

Good point! After comparision: No, the SSHD config is equal to debian default.
I've tested the deployment even with a fresh debian installation.
md5sum of my original sshd_config: e6fd6e8e29210c5678181f33177d5433

Do you think you could write a snippet/open a PR for this?

No Problem, merge it 👍
#281