docs(qbittorrent): add auto port forward docs (#15348)

**Description**
Adds documentation describing automatic port forwarding sidecar.

⚒️ Fixes  # 

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**

**📃 Notes:**

**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ ] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

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charts/stable/qbittorrent/docs/port-forwarding.md

@@ -0,0 +1,13 @@
+# Automatic Gluetun Port Forwarding
+
+qBittorrent can be configured to automatically utilize the VPN forward port when used with Gluetun.
+
+:::danger GLUETUN PORT FORWARDING REQUIRED
+
+qBittorrent will fail to start if Gluetun is not configured for use with port forwarding enabled.
+
+:::
+
+To enable automatic port forwarding check the box `Gluetun Port Forwarding` in the qBittorrent App Configuration section.
+
+You are required to provide the qBittorrent WebUI username and password. Because of this requirement you *CANNOT* enable this feature until you have completed the installation of qBittorrent and configured the WebUI username and password in the qBittorrent settings first.