feat: another example of using

[Truenya]

just yet another example(found on stackoverflow)

[tobixen]

The icalendar library is not so external, the caldav library already has support for it. Anyway, fix those issues and I'll include this example.

[tobixen]

Also, style test breaks due to the pesky requirements that lines should not exceed 78 characters (I personally hate this limit, but still I believe the python-caldav library should follow the PEP and the "industry standard"). This can be fixed easily by running tox -e style and commit.

[tobixen]

Style check is still failing

[Truenya]

@tobixen fixed