Create file_watcher_EVT.js

[ParallaxOnline]

Simple file watch event. Triggers when a file is created in a dir.

I had a use, Someone else might hence why i'm requesting a merge.

Please describe the changes this PR makes and why it should be merged:

Status

• [✅] Code changes have been tested against the Discord API and the discord.js wrapper, or there are no code changes
• [✅] Documentation has been added/modified, or there is nothing to change (docs/mods.json)

Semantic versioning classification:

• [ ] This PR changes DBM's interface (methods or parameters added to default methods)
• [ ] This PR only includes non-code changes, like changes to documentation, README, etc.

[TheMonDon]

Please fix linting errors