docs(readme): add missing required email in insert examples

[nesb1]

Change Summary

Hello.
In example schema.prisma file User has email required field. But in example with python client specified only name. If run it example than an error will occur:
prisma.errors.MissingRequiredValueError: Failed to validate the query: `Unable to match input value to any allowed input type for the field. Parse errors: [Query parsing/validation error at `Mutation.createOneUser.data.UserCreateInput.email`: A value is required but not set., Query parsing/validation error at `Mutation.createOneUser.data.UserUncheckedCreateInput.email`: A value is required but not set.]` at `Mutation.createOneUser.data

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

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[RobertCraigie]

Thank you for spotting this!