Adding unRAID section to the Wiki with some rough instructions for setting up mongoDB

unRAID.md

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+Please note:
+This is a quick write-up of how you can connect mongoDB to YoutubeDL-Material.
+There will be more documentation about running YoutubeDL-Material on unRAID in the future, probably once 4.3 releases.
+
+## Introduction
+Running YoutubeDL-Material on unRAID at the moment is possible, however there are caveats.
+To run a medium-sized database successfully and enjoy the benefits of backing up channels and one-off videos today already we encourage you to try your hand at testing the nightly builds of YoutubeDL-Material on your hardware. unRAID of course not being an exception.
+
+## Limitations
+* The application still needs to be more responsive for shutdowns of the app to be graceful at all times.
+* The scalability is limited as of now. Whilst you can absolutely run many subscriptions to channels and have a lot of files managed by YoutubeDL-Material, it is VERY advised to run this with a mongoDB connected. A basic setup that assumes you have some level of unRAID knowledge container management already (e.g. adding and editing environment variables in them) is written down below. Even with mongoDB connected the experience still will scale with slowdowns on large databases (e.g. tens of thousands of videos stored), because performance optimizations in the codebase are still needed.
+
+## mongoDB Database Setup
+Take the official mongoDB container as posted in the CAs, remove the values from the template for the admin user and password, set networking to host and set the port to your desired value.
+
+Then in ytdl-m (make sure you're on a nightly build that supports mongoDB), do these things:
+
+1. Making backups of the database you have always is a must. Preferably before shutting down the container. Especially pre-mongoDB the database stored in its json files is flakey if you have a large dataset or currently working downloads and/or subs.
+2. Go to Settings > Database and set the mongoDB connection string to what the example shows, only that you fill in the IP and port of your mongoDB. We set mongoDB to be host networked, so your unRAID's IP address and the mongoDB port should do.
+3. Hit save.
+4. Click test connection string. (hitting save was required before testing in a previous nightly build. Not anymore though)
+5. If the connection is successful, hit "Transfer DB to mongoDB" or similarly worded (it says "... to Local" for me now, so can't check without ctrl+F'ing into the code, which I'm too lazy to do atm :P)
+6. Shut down the container safely
+7. I added these keys to my template (I'm using a DIY template, not the one from the CAs, build should work regardless!):
+variable 'ytdl_use_local_db' set to false
+variable 'write_ytdl_config' set to true
+This is probably optional, but that's what I did. So... ymmv