✨ Added an imager welcome example

[Arthurdw]

A new example which shows how you would make a member welcomer, this example also shows a way on how you can import all cogs from a directory.

Variant:

Changes

• adds: A welcome example

Check off the following

• I have tested my changes with the current requirements
• My code follows the pep8 code style.

[codecov]

Codecov Report

Merging #453 (1824f7c) into main (f9342a7) will not change coverage.
The diff coverage is n/a.

❗ Current head 1824f7c differs from pull request most recent head eebb8e8. Consider uploading reports for the commit eebb8e8 to get more accurate results

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   91.17%   91.17%           
=======================================
  Files           9        9           
  Lines         102      102           
=======================================
  Hits           93       93           
  Misses          9        9           

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