feat(service): Add Mastodon

[fireynis]

Description

Added in a client for the Mastodon distributed social network. I used the matt-n library but

Motivation and Context

This was a requested feature for the Notify project here: #6

How Has This Been Tested?

I have not added tests to it, effectively all of the work is done through another package and no real work is done in this file. A unit a test seems not very useful, but I am happy to be wrong.

I am looking for feedback, or this can be something that is merged in and as a second PR I can add tests

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

[nikoksr]

Hi @fireynis, first of all, we greatly appreciate your efforts and contribution. We'd be really excited to merge this into Notify.

Checking your work, I can't fail to notice however that you did not meet certain standards that we're pursuing. Before we go ahead and review your code, I'd ask you to add some (at least) basic documentation and most preferably quality tests.

If there's anything @svaloumas or I can help you with, please let us know! Check out an already existing service like Twilio for details on how to document and test your Notify service.