API-37: Adding endpoints for climbing route rating app (!16)

Co-authored-by: Patrick Mueller <patrick@mueller-patrick.tech>
Reviewed-on: #16
Co-authored-by: Patrick Müller <patrick@plutodev.de>
Co-committed-by: Patrick Müller <patrick@plutodev.de>

src/models/climbing-route-rating/ClimbingRouteRating.db.ts

@@ -0,0 +1,19 @@
+import * as dotenv from 'dotenv';
+
+const mariadb = require('mariadb');
+
+dotenv.config();
+
+export namespace ClimbingRouteRatingDB {
+    const pool = mariadb.createPool({
+        host: process.env.DB_HOST,
+        user: process.env.DB_USER,
+        password: process.env.DB_PASSWORD,
+        database: process.env.CRR_DATABASE,
+        connectionLimit: 5
+    });
+
+    export function getConnection() {
+        return pool;
+    }
+}