Add installation guide for Copyparty file server

This document provides instructions for installing and configuring Copyparty as a file server, including creating a service and setting up a configuration file.

tutorials/installing-copyparty.md

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+# Installing Copyparty for file sharing
+An essential component to every server is file sharing, and for that you can use Copyparty, which is a handy file server contained in a single Python script - making it portable, while still fast and feature rich.
+
+## Getting the files
+You can download the latest release of Copyparty on the releases tab of the GitHub repository. [Here's a link to save you time.](https://github.com/9001/copyparty/releases/latest)
+
+You'll usually want to download `copyparty-sfx.py`, but you can refer to the software documentation about the other versions.
+
+## Creating a service
+For managing your server more comfortably, we're going to create a service for your file server. This allows the server to run on background, without locking a shell session just to output it's logs, and you can easily start and stop the server without the need to manually kill it's process.
+
+Before continuing, make sure the package `termux-services` is installed. Then you can run this command to create it's service.
+
+```bash
+mkdir -p $PREFIX/var/service/copyparty/log
+ln -sf $PREFIX/share/termux-services/svlogger $PREFIX/var/service/copyparty/log/run
+```
+
+Then edit `$PREFIX/var/service/copyparty/run` with something like this:
+
+```bash
+# Replace this path with the directory you put your Copyparty Python file.
+cd ~/path/to/your/python/file
+# Replace the path after '-c' with the path to where you want to keep your config file.
+exec python copyparty-sfx.py -c /sdcard/copyparty.conf
+```
+
+**Remember:** by default, Copyparty will only manage subdirectories of the directory it is in.
+
+## Configuring
+Create the file you specified in the `-c` parameter of your startup script, then open it with a text editor.
+
+This is a simple config that starts a server in the port `8080`, with a single user called `a dmin` with a password `changeme` and read-write-modify-delete permissions:
+
+```yaml
+[global]
+  p: 8080
+  e2dsa
+  e2ts
+  z, qr
+
+# create users:
+[accounts]
+  admin: changeme   # username: password
+
+# create volumes:
+[/]         # create a volume at "/" (the webroot), which will
+  .         # share the contents of "." (the current directory)
+  accs:
+    rwmd: admin  # read-write-modify-delete
+```
+
+## Starting
+If you created a service for Copyparty, you can start it by running the command `sv up copyparty` and stop with `sv down copyparty`. If you want to start it automatically run `sv enable copyparty`.
+
+If you didn't make a service, you can start the server by running Copyparty's Python file with the command `python copyparty-sfx.py`.