Templating

[niccokunzmann]

Description of change

This adds templating.

• [ ] fix docs
• [ ] add templating for events

Have a look at the tests added ...

Contributes to #17 Contributes to #21

Pull-Request Checklist

• [x] Code is up-to-date with the main branch
• [x] This pull request follows the contributing guidelines.
• [x] This pull request links relevant issues as Fixes #0000
• [x] There are new or updated unit tests validating the change
• [x] Documentation has been updated to reflect this change
• [x] The new commits follow conventions outlined in the conventional commit spec, such as "fix(api): prevent racing of requests".

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/mergecal/calendar_merger.py	86.11% <100.00%> (+6.11%)	:arrow_up:

[niccokunzmann]

Hi @abe-101, I added templating as I thought would be useful. The yaml specification allows for a lot of flexibility in the future as well as backwards compatibility and a unified interface for Python/command line usage.