Implement promise polyfill#40

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clovis1122 wants to merge 2 commits intonitish24p:masterfrom

clovis1122:feature/promise-polyfill

Commits on Oct 6, 2020

Add promise polyfill base; missing answer
clovis1122
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Commits on Oct 7, 2020

Add an example implementation for promise
clovis1122
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