Minor grammar changes to readme.md
Minor grammar changes to readme.md

As an American, please let me apologize for our arbitrary grammer.
kakadiya91/ydn-db,yathit/ydn-db,yathit/ydn-db,kakadiya91/ydn-db,yathit/ydn-db,kakadiya91/ydn-db,kakadiya91/ydn-db,kakadiya91/ydn-db,yathit/ydn-db,yathit/ydn-db