docs(backend): add swagger documentation

backend/src/main.ts

@@ -1,6 +1,7 @@
 import { ClassSerializerInterceptor, ValidationPipe } from "@nestjs/common";
 import { NestFactory, Reflector } from "@nestjs/core";
 import { NestExpressApplication } from "@nestjs/platform-express";
+import { DocumentBuilder, SwaggerModule } from "@nestjs/swagger";
 import * as bodyParser from "body-parser";
 import * as cookieParser from "cookie-parser";
 import * as fs from "fs";
@@ -18,6 +19,17 @@ async function bootstrap() {
   await fs.promises.mkdir("./data/uploads/_temp", { recursive: true });
 
   app.setGlobalPrefix("api");
+
+  // Setup Swagger in development mode
+  if (process.env.NODE_ENV == "development") {
+    const config = new DocumentBuilder()
+      .setTitle("Pingvin Share API")
+      .setVersion("1.0")
+      .build();
+    const document = SwaggerModule.createDocument(app, config);
+    SwaggerModule.setup("api/swagger", app, document);
+  }
+
   await app.listen(8080);
 }
 bootstrap();