Add QNAP NAS Guide

docs/how_to_setup_podsync_on_qnap_nas.md

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+# Podsync on QNAP NAS Guide
+
+*Written by [@Rumik](https://github.com/Rumik)*
+
+1. Install Container Station from App Center.
+2. Create a shared folder on your QNAP for where you want Podsync to store its config file and data,
+e.g. `/share/CACHEDEV1_DATA/appdata/podsync`
+3. Create a `config.toml` file in Notepad or whatever editor you want to use and copy it into the above folder.
+Here you will configure your specific settings. Here's mine as an example:
+
+```toml
+[server]
+port = 6969
+data_dir = "/share/CACHEDEV1_DATA/appdata/podsync"
+hostname = "http://my.customhostname.com:6969"
+
+[tokens]
+youtube = "INSERTYOUTUBEAPI" # Tokens from `Access tokens` section
+
+[feeds]
+  [feeds.KFGD] # Kinda Funny Games Daily
+  url = "youtube.com/playlist?list=PLy3mMHt2i7RIl9pkdvrA98kN-RD4yoRhv"
+  page_size = 3
+  update_period = "60m"
+  quality = "high"
+  format = "video"
+  cover_art = "http://i1.sndcdn.com/avatars-000319281278-0merek-original.jpg"
+```
+
+Note that I'm not using port `8080` because I already have another app on my QNAP using that port.
+I'm using port `6969` specifically because `Bill & Ted!`.
+Also, I'm using my own hostname so I can download the podcasts to my podcast app from outside my network,
+but you don't need to do this. To make that work, make sure you forward port `6969` to your QNAP.
+
+4. By now, Container Station should have finished installing and should now be running.
+Now you need to SSH into the QNAP using an app like Putty (on Windows - just google for an app).
+
+5. Copy and paste the following command:
+
+```bash
+docker pull mxpv/podsync:latest
+```
+
+Docker will download the latest version of Podsync.
+
+6. Copy and paste the following command:
+
+```bash
+docker run \
+    -p 6969:6969 \
+    -v /share/CACHEDEV1_DATA/appdata/podsync:/app/data/ \
+    -v /share/CACHEDEV1_DATA/appdata/podsync/config.toml:/app/config.toml \
+    mxpv/podsync:latest
+```
+
+This will install a container in Container Station and run it. Podsync will load and read your config.toml file and start downloading episodes.
+
+7. I recommend you go into the container's settings in Container Station and set it to Auto Start.
+
+8. Once the downloads have finished for each of your feeds, you will then have an XML feed for each feed
+that you should be able to access at `http://ipaddressorhostname:6969/`. Paste them into your podcast app of choice,
+and you're good to go!