Added models to persistance.xml

added database models to persistence xml

src/main/resources/META-INF/persistence.xml

@@ -9,6 +9,10 @@
 
         <!-- Entity classes -->
         <class>NTNU.IDATT1002.models.ImageAlbum</class>
+        <class>NTNU.IDATT1002.models.Tag</class>
+        <class>NTNU.IDATT1002.models.Metadata</class>
+        <class>NTNU.IDATT1002.models.Histogram</class>
+        <class>NTNU.IDATT1002.models.GeoLocation</class>
 
         <properties>
             <!-- Configuring JDBC properties -->