Create official tag list and add to documentation

After a discussion in the Gitter channel around there being no list of tags I'm raising this issue for discussion around this before creating the docuimentation.

It's been suggested that the documentation be created on the [Creating Packages](https://github.com/chocolatey/choco/wiki/CreatePackages) page.

The list of tags I'm aware (off the top of my head):

* admin - installer requires Administrator privileges (such as installing Program Files);
* trial - package is a trial version
* notsilent - package requires interaction by the user after install / uninstall (such as browser windows opening and needing to be closed manually - note that it doesn't include the installer being visible as long as there is no interaction required).

List of tags I'd like to add:

~~* licensed - package requires a license to use - this is different from trial which still runs for a period of time;~~ license tag is already [recommended](https://chocolatey.org/docs/moderation).

Also highlight that packages [should not include the tag 'chocolatey'](https://github.com/chocolatey/choco/wiki/Moderation)

## Agreed Tags

The tags so far agreed on are:

* admin
* trial
* notsilent
* license

## Tags Under Discussion

Package category tags still under discussion:

* productivity
* programming
* utility
* browser
* drivers
* server
* client
* addon

Other tags still under discussion:

* notUninstallable