add support for matrix server

[ahdekkers]

Description

Added matrix service

Fixes #61

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Running existing tests
• Created new tests

Checklist:

• My code has been linted (make lint)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have rebased my branch to include the latest changes from master

[ahdekkers]

Let me know if I should make any changes, @kha7iq

[kha7iq]

@ahdekkers Sorry for the delay , i am swamped with some work these days.
Just a small thing, can you please confirm if you have tested sending messages to matrix server with the changes ?
Also can you please lint the code make lint and see if everything is good. I will merge afterwards

[ahdekkers]

Hey, no worries. Yeah sending matrix messages work, I only used official matrix servers for the testing. The make lint isn't working for me - for some reason it tells me:
golangci-lint run ./... ERRO Running error: context loading failed: no go files to analyze make: *** [lint] Error 5
Same thing when I run golangci-lint run service/matrix. Have you encountered this before and does it work for you?