WIP: Docs: Describe how to connect QField to local QFC dev instance.

[lukasgraf]

Add some docs that describe how to connect QField to local QFC dev instance.

[Rakanhf]

This is amazing ! Thank you. 🚀

I read the document, and for me it was very easy to setup, and I also can use something like hostname -I to get the ip. I'm not sure if this will work for every one or other OS, but it get the job done in ubuntu.

[gounux]

Just a spotted typo :)
Thanks for this guide !

[gounux]

Suggested change

	- Your dev machien and your mobile phone need to be on the same network (e.g. same WiFi)
	- Your dev machine and your mobile phone need to be on the same network (e.g. same WiFi)

[suricactus]

Suggested change

	- For easier access via hostname, you need to have an mDNS service like avahi running on your dev machine.
	- For easier access via hostname, you need to have an mDNS service like `avahi` running on your dev machine.

[suricactus]

Suggested change

	If not, install `avahi-daemon` and make sure it's running. That should then allow you to access your dev machine as `<your-dev-machine-hostname>.local` from devices on the same network. E.g. if the hostname of your dev machine is `foo`, you should be able to reach it using `ping foo.local` from another machine on the same network.
	If not, install `avahi-daemon` and make sure it's running.
	That should then allow you to access your dev machine as `<your-dev-machine-hostname>.local` from devices on the same network.
	E.g. if the hostname of your dev machine is `foo`, you should be able to reach it using `ping foo.local` from another machine on the same network.

We tend to add new markdown with one sentence per line for better history tracking.

[suricactus]

Suggested change

	In order to connect the QField mobile app to your local QFieldCloud development instance, the following prerequisites must be met:
	QFieldCloud REST API is used across clients, including the QField app.
	One can test their local QFieldCloud instance by running QField on their development machine.
	[Install QField](https://qfield.org/get) for your operating system.
	In order to connect QField from a device different from your development machine (e.g. your mobile phone), the following prerequisites must be met:

Not sure what was the use case, but 95% of the time you better test the APIs using the desktop client, because you also have (easy) access to the configuration files. I guess it needs a bit of reordering, so in the injected paragraph above we can point to the bullet with instructions - start, type ip etc etc.

[suricactus]

Good stuff here, I guess for less GIS people is helpful.

A few comments:

• Don't forget a symbol a the end of the line otherwise the letters will fall off.
• Make it clear that most of the cases the easier (I would even use the preferable) way for testing the majority of cases is the desktop app. (I guess SSO and integrated positioning are the exclusions).
• If you use ordered bullet list as it is always easier to read and ask questions later.
• Try to keep one sentence per line when markdown allows it. Helps with git history later.

Side note not directly related to this PR: the README is getting massive, we either need to reorganize it, or we split it. No need to do anything for now.