Write a function that will take a query string as an argument and return the key-value pairs as a dictionary.

query = ?one=1&two=2
parameters(query) => {'one': '1', 'two': '2'}

query = ?foods=butter&foods=cake&foods=chicken
parameters(query) => {'foods': ['butter', 'cake', 'chicken']}

query = ?username=codefellows&password=learnmorefaster&courses=code201&courses=code301&courses=code401-python&courses=code401-javascript&courses=code401-dotnet
parameters(query) =>
{
  'username': 'codefellows',
  'password': 'learnmorefaster',
  'courses': ['code201', 'code301', 'code401-python', 'code401-javascript', 'code401-dotnet']
}

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