add a basic landing page

projects/backend/src/controller/app.controller.ts

@@ -1,5 +1,6 @@
 import { Controller, Get } from "elysia-decorators";
 import { getAppVersion } from "../common/app-utils";
+import { AppService } from "../service/app.service";
 
 @Controller()
 export default class AppController {
@@ -10,4 +11,9 @@ export default class AppController {
       version: getAppVersion(),
     };
   }
+
+  @Get("/statistics")
+  public async getStatistics() {
+    return await AppService.getAppStatistics();
+  }
 }

projects/backend/src/service/app.service.ts

@@ -0,0 +1,15 @@
+import { PlayerModel } from "../model/player";
+import { AppStatistics } from "@ssr/common/types/backend/app-statistics";
+
+export class AppService {
+  /**
+   * Gets the app statistics.
+   */
+  public static async getAppStatistics(): Promise<AppStatistics> {
+    const trackedPlayers = await PlayerModel.countDocuments();
+
+    return {
+      trackedPlayers,
+    };
+  }
+}