Retrieve cryptocurrency exchange rates

• Retrieve a list of cryptocurrencies given set of tickers. e.g.['BTC', 'XRP', 'ETH']
• Retrieve a list of specific cryptocurrencies and specific values based on the ticker and any other dynamic params e.g. [circulating_supply, max_supply, name, symbol, price] for [ETH, BTC]
• Retrieve a specific cryptocurrency to specific fiat. e.g. BTC in ZAR or ETH in USD
• Calculate the price of one cryptocurrency from another, in relation to their dollar value e.g. 1BTC = 100USD, 1ETH = 50USD, therefore 1ETH == 0.5BTC

• Ensure you have ruby 3.0.0 install locally preferably by using a ruby version manager like rbenv
• Run bundle install to install the dependencies
• Run ruby app/app.rb to start the server and navigate to the url that will appear in the terminal
• Run the tests with bundle exec rspec. A coverage report will also be generated under coverage/index.html.