Create a class that is a dictionary, storing words (as string) and their definition (also as string). Use an indexer to allow users of the dictionary to add, modify and retrieve definitions of words.

• You should be able to add a word like this: dictionary[orange] = A small round juicy citrus fruit.;

• You should be able to change a definition by reusing the same key word: dictionary[orange] = A small round citrus fruit, typically grown in Florida and California.;

• You should also be able to retrieve a definition using the indexer: string definitionOfOrange = dictionary[orange];

Note: the .NET platform already defines a Dictionary class, which uses generics and in the real world could be used to do what the exercise is trying to do here, plus a lot more. Do not use that class for this exercise.