init docs

docs/podman.md

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+# Podman
+
+## Why?
+On that server we use podman instead of docker because it's:
+- rootless by default
+- individual for each user (you won't be able to access container of other person)
+- have preinstalled k8s (which is called pod and idk why it's needed for us but it's hella cool)
+
+## How to use? 
+Exactly the same as docker, but, obviously, instead of `docker` write `podman`. More documentation find [there](https://podman.io/docs)
+
+Maybe (just maybe) you'll need to run this thing (but I still not ceratin if it's necessary):
+```sh
+systemctl --user enable --now podman.socket
+```
+