Add GraphqlService to handle GraphQL requests

src/graphql/graphql.module.ts

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+import { Module } from '@nestjs/common';
+import { GraphqlService } from './graphql.service';
+import { GraphqlResolver } from './graphql.resolver';
+
+@Module({
+  providers: [GraphqlService, GraphqlResolver],
+})
+export class GraphqlModule {}

src/graphql/graphql.resolver.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { GraphqlResolver } from './graphql.resolver';
+
+describe('GraphqlResolver', () => {
+  let resolver: GraphqlResolver;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [GraphqlResolver],
+    }).compile();
+
+    resolver = module.get<GraphqlResolver>(GraphqlResolver);
+  });
+
+  it('should be defined', () => {
+    expect(resolver).toBeDefined();
+  });
+});

src/graphql/graphql.resolver.ts

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+import { Resolver, Query, Mutation, Args } from '@nestjs/graphql';
+import { PrismaService } from 'src/prisma/prisma.service';
+import { User } from '@prisma/client';
+
+@Resolver('User')
+export class GraphqlResolver {
+  constructor(private readonly prismaService: PrismaService) {}
+
+  @Query(() => [User])
+  async users(): Promise<User[]> {
+    return this.prismaService.user.findMany();
+  }
+
+  @Mutation(() => User)
+  async createUser(
+    @Args('email') email: string,
+    @Args('name', { nullable: true }) name?: string,
+  ): Promise<User> {
+    return this.prismaService.user.create({
+      data: {
+        email,
+        name,
+      },
+    });
+  }
+}

src/graphql/graphql.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { GraphqlService } from './graphql.service';
+
+describe('GraphqlService', () => {
+  let service: GraphqlService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [GraphqlService],
+    }).compile();
+
+    service = module.get<GraphqlService>(GraphqlService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/graphql/graphql.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class GraphqlService {}