Added Hexabin API

Added Sentium API - Issue #1590

Removed inactive Linkedin API

Added Kaggle API

Add Art Institute of Chicago API

Add GoFile API

Re: Added Open Source Bhagavad Gita API (#1527)

As per requested @marekdano

add dummy products api

Add Carbon Interface API

added openrouteservice.org

Adds Boston MBTA API to Transportation

Added SpotSense API information in geocoding section

Add Board Game Geek API

Added UK Government coronavirus API

Added hubblesite API

As requested by the reviewer PR updated in order to fix API duplication and missing https for hubblesite.

Added YTS API in Video Category

Add Twelve Data API (finance section)

Added Satellite Passes API

Update Vector Express to match v2.0

Move CONTRIBUTING.md to the root folder

Add NBP (National Bank of Poland) currency exchange rates API

Add VALR (Cryptocurrency Exchange in South Africa) API