feat(api): user authentication

src/sources/sources.module.ts

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+import { Module } from '@nestjs/common';
+import { SpotifyModule } from './spotify/spotify.module';
+
+@Module({
+  imports: [SpotifyModule]
+})
+export class SourcesModule {}

src/sources/spotify/spotify-connection.entity.ts

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+import { Column } from "typeorm";
+
+export class SpotifyConnection {
+  @Column()
+  id: string;
+
+  @Column()
+  accessToken: string;
+
+  @Column()
+  refreshToken: string;
+}

src/sources/spotify/spotify.module.ts

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+import { Module } from '@nestjs/common';
+import { SpotifyService } from './spotify.service';
+import { SpotifyApiModule } from './spotify-api/spotify-api.module';
+
+@Module({
+  providers: [SpotifyService],
+  imports: [SpotifyApiModule]
+})
+export class SpotifyModule {}

src/sources/spotify/spotify.service.spec.ts

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

src/sources/spotify/spotify.service.ts

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+import { Injectable } from '@nestjs/common';
+import {Interval} from "@nestjs/cron"
+
+@Injectable()
+export class SpotifyService {
+  @Interval
+
+}