Create user microservice skeleton with nest.js and create the first e2e test for user registration.

[dadiorchen]

Please refer to this project: https://github.com/Greenstand/treetracker-like/tree/main/apps/like and create the restful microservice, now there isn't database table for user, so don't need to worry about db and prisma stuff.

The goal:

• [ ] Copy and create the microservice skeleton based on nest.js
• [ ] Create the first endpoint as defined here: https://github.com/Greenstand/treetracker-wallet-app/blob/4e9c9775db162e5f89e426b4005d27e7234d6f61/apps/user/docs/api/spec/user-api.yaml#L12 actualy, @pierrelstan has implemented it, refer to his code here: https://github.com/Greenstand/treetracker-wallet-app/pull/248/files
• [ ] Define command: 'yarn e2e' to run the e2e test, which uses superequst to request the registration endpoint and get 201/200 response successfully.