Add minimal example

[NickyMeuleman]

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tRPC code uses the same example as: https://github.com/trpc/trpc/tree/next/examples/minimal minimal Electron in TypeScript example from: https://github.com/ProfXwing/electron-quick-start-typescript

I wasn't successful in importing something to the renderer. Probably some tsconfig mismatches. Maybe browsers can't import tRPC without a bundler?

[JoeHartzell]

I'm going to pick this up. electron-trpc should definitely have a vanilla example. It's also a good place for us to run e2e tests without having to worry about frameworks