Added open-hockey-api to made-with.md

Feel free to give me feedback on the word selection/sentence length for the description.

I created this project a bit ago but had to put it to the side for longer than I'd like. Looking to pick this project back up and incorporate it in some serverless automation and eventually add GQL subscriptions to it to allow real-time notifications around goals and game outcomes/schedules, etc.

Be sure to look at the bottom of my readme and play around with the dev GraphQL playground to explore what I already have available!

My real hope is that someone will find this GraphQL API handy and use it to build a nice UI/App or just learn/practice some GraphQL. Thanks so much for this project you have going!