Guidance for plugin development

Hello

I have written a plugin for v2 that allows TOCs to use glob matching patterns to include multiple files - so you can do stuff like this in TOC.yml
```
- name: Some specific file
href: someSpecificFile.md
- name: All other files
items:
- name: Expand{Hierarchical}
includedFrom: '**/*.md'
```

I have two questions -

1) Is there a good process for distribution for plugins?
2) The plugin is built against the 2.59 nuget packages currently - is there any information about how to go about porting it for v3? I have tried to find information on it but I don't see any v3 preview packages on nuget.org and I couldn't find anything about plugins that was specific to v3. Apologies if my google-fu is weak.