Implementing the constructor of MatchController class
Implementing the getInstance() method to develop the singleton pattern
Implementing register_Match() in MatchController class
Implementing exclude_Match() in MatchController class
Implementing exclude_AllMatches() in MatchController class
Implementing find_MatchById() in MatchController class
Implementing include_Competitors() in MatchController class
Implementing include_Winners() in MatchController class
Implementing include_Losers() in MatchController class
Merge branch 'MatchController' into controller