Updated documentation explaining how to run the AppStandalone project

[josancamon19]

Let me know if the guide is clear, please try to replicate it

[Wladefant]

doing gods work I will check it out today, as I was able to run everything, but somehow it wasnt stable and most of the time not working

[after-ephemera]

This probably won't work out of the box for new clones since the ios project hasn't been built yet. Here is the error I got:

pod install                                                                                                     
Ignoring msgpack-1.7.1 because its extensions are not built. Try: gem pristine msgpack --version 1.7.1   

...

Generating Pods project                                                                                                      
[!] An error occurred while processing the post-install hook of the Podfile.
                                                                                                                                                                                                                                                          
/Users/jkjensen/dev/flutter/bin/cache/artifacts/engine/ios/Flutter.xcframework must exist. If you're running pod install manually, make sure "flutter precache --ios" is executed first      

If the user runs flutter precache --ios first then the pod install should succeed.

Suggested change

	pod install
	flutter precache --ios
	pod install

[josancamon19]

Weird, @after-ephemera I personally don't remember ever having to do that in a flutter project, I don't know if I would add it as part of the steps, can someone else try to replicate this guide, and double check if they need flutter precache --ios, thanks.

[akshaynarisetti]

Thanks for Pull, Merging