Add Nexus CRUD example

[nikolasburk]

We should have an example that shows how to expose a full CRUD API for Prisma models using t.crud.

[darrylyoung]

Yeah, I think that would be really useful, especially for people starting out.

[Nhilesh]

Another great tooling https://paljs.com/ works better, I got the prisma client working less then a minute. Just a suggestion, Nexus documentation for Prisma 2 kinda sucks

[koniuszy]

i believe we don't want to achieve this with the dead nexus-prisma-plugin : https://github.com/graphql-nexus/nexus-plugin-prisma right? afair the recommended way is to use pure nexus

what's the real alternative here? - waiting for the new nexus-prisma integration? https://github.com/prisma/nexus-prisma the crud feat seems to be far away :/

with explicitly pointed stack I will be glad to provide such an example