Add database connection implementation

src/main/java/dev/database/DatabaseConnection.java

@@ -1,6 +1,7 @@
 package dev.database;
 
-import java.sql.Connection;
+import  java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.SQLException;
 
 public class DatabaseConnection {
@@ -18,10 +19,8 @@ public class DatabaseConnection {
     public static Connection getConnection()
             throws SQLException {
 
-        // TODO:
         // Return a valid PostgreSQL connection
-
-        return null;
+        return DriverManager.getConnection(URL, USER, PASSWORD);
     }
 
 }