Currency Conversion

In here I have created two things. First being a Currency Class that represents amount of currency and the other is a Currency Converter that can convert between different Currency types using correct rates.

Currency objects:

• Created Currency Class with an amount and a currency code. (I used "type" instead of "code")
• New Currency equals another object with the same currency type but does NOT equal another Currency object or type.
• Currency object is able to be added and subtracted with Currency of the same type.
• Created a new error code called "CurrencyTypeError" that crashes program when two Currency objects with different types try and add or subtract.
• Currency object is able to be multiplied by a Fixnum or Float and return that Currency object.
• Created a Hash with symbols and types to refer to for pulling out symbols ($) and identifying them with their corresponding type (USD).

Currency Converter:

• Created Currency Converter with a Hash of currency types and their corresponding rates.
• The Converter is able to take a Currency objects of the same type and return a Currency object equal to the one passed through the Converter.
• Converter is also able to convert any currency type to another type using the correct rates.
• The Converter also has its own CurrencyUnknownError when trying to convert currency types that are unknown.