making Singelton pattern

[mikelfried]

Adding the Singelton Pattern

[codecov-io]

Codecov Report

Merging #256 into master will decrease coverage by 0.01%.
The diff coverage is 96%.

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   97.75%   97.74%   -0.02%     
==========================================
  Files          61       62       +1     
  Lines        2276     2301      +25     
==========================================
+ Hits         2225     2249      +24     
- Misses         51       52       +1

Impacted Files	Coverage Δ
creational/singelton.py	96% <96%> (ø)

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[faif]

Hi,

Thanks for the pull request but there are no plans to add singleton to this repository. See past discussion in #233 and #226

[gyermolenko]

hi @faif . maybe we could add this pattern as "no go" into readme, with corresponding remark?
Not everybody will look through closed issues to see your comments.
And people definitely talk about this pattern a lot.

[faif]

Added the wontfix label, that should help