docs(Jellyseer): Add Installation Guide (#19198)

**Description**
I have created installation and setup instructions for Jellyseerr.

⚒️ Fixes  # Confusion

**⚙️ Type of change**

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

**🧪 How Has This Been Tested?**
I have followed the steps I created to setup Jellyseerr myself.

**📃 Notes:**


**✔️ Checklist:**

- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [x] 📄 I have made corresponding changes to the documentation
- [x] ⚠️ 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 added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
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---------

Signed-off-by: platnub <81484914+platnub@users.noreply.github.com>

charts/stable/jellyseerr/docs/how-to.md

@@ -0,0 +1,50 @@
+---
+title: Setup Guide
+---
+
+**Jellyseerr** is a free and open source software application for managing requests for your media library. It is a fork of [Overseerr](https://github.com/sct/overseerr) built to bring support for [Jellyfin](https://github.com/jellyfin/jellyfin) & [Emby](https://github.com/MediaBrowser/Emby) media servers!
+## Requirements
+
+- Jellyseerr TrueCharts Chart
+- Jellyfin TrueCharts Chart
+- Installation of the TrueCharts Catalog, starting [here](https://truecharts.org/manual/SCALE/guides/getting-started#adding-truecharts)
+
+## Install Jellyseerr inside TrueNAS SCALE
+
+- Select `Apps` inside the `TrueNAS` menu,
+- Then choose the `Available Applications` tab,
+- and search for `jellyseerr`
+
+![Search Jellyseer](./img/SearchJellyseerr.png)
+
+- Click the Install button, and you’ll be prompted to set up the **Jellyseer** software.
+- Most of the settings can be left at the default values, but ensure you select the correct
+  timezone before scrolling down to the Networking and Services section.
+  Take note of the default port (10241) that **Jellyseerr** listens on.
+
+Scroll to the bottom of the window and click Save.
+
+Once you hit Save, the process of downloading and setting up **Jellyseerr** will begin.
+Switch back to the Installed Applications tab, and wait for the application to switch
+from Deploying to Active - once it does, click the Open button to launch the **Jellyseerr** welcome portal.
+
+## Jellyseerr Initial Setup
+
+- Select "Use your Jellyfin account" and fill in your Jellyfin URL, Email address
+- Define a user to be used for administrative purposes in **Jellyseerr** and click next.
+
+![JellyseerrSetupSignIn](./img/JellyseerrSetupSignIn.png)
+
+- Sync your libraries automatically and enable any libaries you want Jellyseer to be able to access.
+- Perform a manual scan and click next after it finishes.
+
+![JellyseerrSetupLibraries](./img/JellyseerrSetupLibraries.png)
+
+- Configure your existing Sonarr/Radarr services you wants to use and click "Finish Setup".
+
+## Support
+
+- You can also reach us using [Discord](https://discord.gg/tVsPTHWTtr) for real-time feedback and support
+- If you found a bug in our chart, open a Github [issue](https://github.com/truecharts/apps/issues/new/choose)
+- For further information on **Jellyseerr** itself, start with their [Github](https://github.com/Fallenbagel/jellyseerr).
+- For further information on operating **Overseerr** itself, start with their [Documentation](https://docs.overseerr.dev/).