snapcraft shouldn't complain about snap/README.md
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Issue body
For some projects, such as edgex-go (and the edgexfoundry snap), there is an extensive amount of documentation surrounding the snap, and so we have a README.md specific to the snap in the snap/ dir in the root of the project, living alongside the snapcraft.yaml. We migrated all the rest of the scripts, icons, etc. for the snap into the snap/local/ dir, but we would like to keep the README.md in the snap/ dir because it's useful for folks wanting to look at the snap to just click on the snap dir in github and see the markdown generated right there.
As such, we'd like to see snap/README.md ignored from the check for additional files in the snap/ folder to remove this warning every time we build the snap:
```
$ snapcraft
The 'snap' directory is meant specifically for snapcraft, but it contains the following non-snapcraft-related paths, which is unsupported and will cause unexpected behavior:
- README.md
If you must store these files within the 'snap' directory, move them to 'snap/local', which is ignored by snapcraft.
```
Also note that this message is issued twice, once before launching the multipass VM, and again after the multipass VM has been started.
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