Update basics.md

[davidbrogan13]

Updated to include where the route_guide_db.json file is located

[linux-foundation-easycla[bot]]

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[sergiitk]

@davidbrogan13 Not sure what you mean by this note. This file is in the cpp examples folder as well: https://github.com/grpc/grpc/blob/master/examples/cpp/route_guide/route_guide_db.json

[dfawley]

CLAs not signed and no response to last question >1mo ago. Closing.