add signature setting

For multiple users it helps to
keep track about who did what.

app/src/main/res/layout/dialog_event_detail.xml

@@ -89,4 +89,25 @@
 
     </LinearLayout>
 
+    <LinearLayout
+        android:id="@+id/dialog_event_signature_layout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="5dp"
+            android:text="@string/dialog_event_detail_signature"/>
+
+        <TextView
+            android:id="@+id/dialog_event_detail_type_signature"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="end"
+            android:text="" />
+
+    </LinearLayout>
+
 </LinearLayout>