Add credits

[samreid]

[samreid]

After the commit 08317b0, credits currently says:

    credits: {
      leadDesign: 'Matthew Blackman',
      softwareDevelopment: 'Matthew Blackman, Sam Reid',
      team: 'Cathy Carter, Ariel Paul, Kathy Perkins, Amy Rouinfar',
      contributors: 'Kelly Findley',
      qualityAssurance: 'Nancy Salpepi, Kathryn Woessner',
      graphicArts: 'Mariah Hermsmeyer',
      soundDesign: 'Ashton Morris',
      thanks: 'Bill Finzer, Gayle Geschwind, Heather Lewandowski'
    },

I believe we can close this issue and make any updates later if needed.