[suggestion] Listing anti-patterns in README

[gyermolenko]

I think listing anti-patterns with some basic reasoning about "why not" is a good idea.

Example - singleton. Although #256 has "won't fix" label

• it is in PRs section, and people (if searching history at all) are searching issues first.
• it was misspelled, Singelton instead of Singleton, therefore impossible to find

Listing most popular anti-patterns (without actual implementation) should allow people to find the name from readme

• immediately assume it was'n just missed by mistake
• see why it is not welcome for python projects

[faif]

Indeed this case save us time. Instead of pointing people to the closed issues that are not easily visible, they will hopefully read the README and find some answers to their questions.