Add Podman.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-docker/Podman.md

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+
+# Using Podman
+
+Podman is a daemonless container engine for developing, managing, and running OCI Containers.
+
+## Basic Commands
+
+- **Run a Container:**
+
+  ```bash
+  podman run -d --name openwebui -p 3000:8080 ghcr.io/open-webui/open-webui:main
+  ```
+
+- **List Running Containers:**
+
+  ```bash
+  podman ps
+  ```
+
+## Networking with Podman
+
+If networking issues arise, you may need to adjust your network settings:
+
+```bash
+--network=slirp4netns:allow_host_loopback=true
+```
+
+Refer to the Podman [documentation](https://podman.io/) for advanced configurations.