create DatabaseConnector and test it

src/test/java/Database.java

@@ -1,8 +1,11 @@
+import ch.hevs.isi.core.DataPoint;
+import ch.hevs.isi.core.FloatDataPoint;
+import ch.hevs.isi.db.DatabaseConnector;
+
 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.util.Properties;
 
-
 public class Database {
     public static void main(String[] args) {
         Properties properties = new Properties();
@@ -11,8 +14,13 @@ public class Database {
         } catch (Exception e) {
             e.printStackTrace();
         }
-        String token = properties.getProperty("TOKEN");
+        String url = properties.getProperty("URL");
+
+        DatabaseConnector db = DatabaseConnector.getMySelf();
+        db.initialize(url);
+
+        FloatDataPoint gridVoltage = new FloatDataPoint("GRID_U_FLOAT", true);
+        gridVoltage.setValue(500);
 
-        System.out.println(token);
     }
 }