docs: dump plugin docs don't provide enough information to even get started
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*Please describe the question or issue you're facing with "Dump plugin - Snapcraft 8.12.0 documentation".*
How do you use the dump plugin? This does not give adequate information to even know how to start.
I do not need this document immediately, but was hoping to link it to someone else to give them some help. Instead I have to scour the internet for examples and provide links to those in order to find out what options there are.
Just adding three examples would be extremely helpful:
1) how to use this with a git repository
2) how to use this to add local files to a target path in the installed snap
3) how to include a subset of files
Explanations of the following would also be great
1) How to override-build to customise the subset of files which end up in the final snap.
2) What all of the options are (e.g. options for source-type and with or without `organize:` etc.).
3) Explain how `organize:` can be used/how it works (or link to where it is explained).
edit: I am willing to provide a rough draft based on what I have found, if it would help enough
*Reported from: https://documentation.ubuntu.com/snapcraft/stable/common/craft-parts/reference/plugins/dump_plugin/*
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