add Database linking template

src/main/kotlin/DataBase.kt

@@ -0,0 +1,15 @@
+import java.sql.DriverManager
+
+// the model class
+data class User(val id: Int, val name: String)
+
+fun main(){
+
+
+    val connection = DriverManager.getConnection(
+        "jdbc:mysql://localhost:3306/sae",
+        "root", "0000");
+
+    // prints true if the connection is valid
+    println(connection.isValid(0))
+}