add description about observer pattern

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Jungpyo Hong 2021-05-06 08:56:57 -05:00 committed by GitHub
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@ -92,6 +92,8 @@ class SingletonPattern {
### Observer Pattern
The observer pattern lets one object observe changes on another object. Apple added language-level support for this pattern in Swift 5.1 with the addition of Publisher in the Combine framework.
## Code Structuring