Add generic typings

[jesster2k10]

• Added generic typings so that way the returned result isn't just any but is also typed too #1
• Added prettier configuration just to keep things clean :)
• Added @apollo/client and graphql as dependencies, since I'm importing types directly from the library (not going to be bundled in the code though, just need to be installed with the library)
• Also used yarn as opposed to npm install (just what I am used to)
• There are still some missing gaps I think, but it's a good starting point