Apply Bridge pattern#466

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JoyBiao wants to merge 5 commits intoExpDev07:masterfrom

JoyBiao:bridge_pattern

Commits on Aug 16, 2021

apply bridge pattern under app/services/location directory. class csbs.py, jhu.py, nyt.py implements the interface DataSourcesInterface in sourcelocations.py. Add BasicLocationService class to impl…
JoyBiao
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