Add getTimegridUnits

src/main/java/ley/untis/UntisClient.java

@@ -189,5 +189,13 @@ public class UntisClient {
         }
     }
 
+    public TimegridResponse getTimegridUnits() throws APIRequestException {
+        try {
+            return client.invoke("getTimegridUnits", new Object[0], TimegridResponse.class);
+        } catch (Throwable e) {
+            throw new APIRequestException(e);
+        }
+    }
+
 
 }

src/main/java/ley/untis/data/TimegridResponse.java

@@ -0,0 +1,17 @@
+package ley.untis.data;
+
+import java.util.ArrayList;
+
+public class TimegridResponse extends ArrayList<TimegridResponse.Day> {
+
+    public static class Day {
+        public int day;
+        public TimeUnit[] timeUnits;
+        public static class TimeUnit {
+            public int startTime;
+            public int endTime;
+            public String name;
+        }
+    }
+
+}