feat(examples): add memeland

[leohhhn]

Description

This PR adds the p/demo/memeland & r/demo/memeland package & realm to the examples folder.

Contributors' checklist...

• [ ] Added new tests, or not needed, or not feasible
• [ ] Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• [ ] Updated the official documentation or not needed
• [ ] No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• [ ] Added references to related issues and PRs
• [ ] Provided any useful hints for running manual tests
• [ ] Added new benchmarks to generated graphs, if any. More info here.

[codecov[bot]]

Codecov Report

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

Project coverage is 47.49%. Comparing base (5c5d9ef) to head (95c6a1c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1751   +/-   ##
=======================================
  Coverage   47.49%   47.49%           
=======================================
  Files         388      388           
  Lines       61311    61311           
=======================================
  Hits        29117    29117           
  Misses      29756    29756           
  Partials     2438     2438           

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