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add readme for clarity and basic desc of the API

readme.md

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+SENTINELCHECK API - Ensemble model fake review prediction for small businesses. 
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+THIS IS SOLELY FOR SUBMISSION TO THE PRESIDENTIAL AI CHALLENGE!
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+This is deployed and final iteration of our submission, any other commits after the submission date are generally for maintenence purposes. 
+All documentation on the API can be found on the bottom of the "App" section of this space. A hyperlink style button with the text "use via API" specifically.
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