Add snap installation instructions

[om26er]

Currently this page https://asciinema.org/docs/installation#installing-on-linux does not refer to snap installation method. I think we need to update that page and (potentially) make that the "default" way of installing asciinema on Linux based systems.

[om26er]

All we need to mention in the instructions is to ensure snapd is already installed on the system. Here are the install instructions for different Linux distros https://snapcraft.io/docs/installing-snapd

The main advantage here is that we can always ensure that users use the latest version of the software, something that comes directly from the upstream without any distro patching

[om26er]

The install command on a snapd based systems would be

snap install asciinema --classic

[cosmos1721]

hey @om26er
if the issue is not assigned to anyone, can I work on it?

[ku1ik]

@cosmos1721 I can add you to the admins of the snap on snapcraft.io if you'd like to help. If so, let me know the email to use when inviting you there.

[cosmos1721]

sure, here's my email: deveshsharma1721@gmail.com