Implemented Model.cs, which organizes the data into a dictionary with
champion IDs as keys and win/loss statistics as values.
Riot doesn't always honor its API rate limit. Fixed Reader.cs to stall
until an API key is available.
Created Gui.cs, which is the GUI for the program. It has a region menu, a
personal win rate box, a minimum number of games filter and a chart of win
rates. The columns of the chart are champion, games played and win rate.
GUI cosmetics are very lacking, but the program is functional. Added
method to Model.cs which calculates win rates from the champion statistics
dictionary. Added method to Reader.cs for API requests for static data,
since those requests have no rate limit.