add signature setting

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

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

@@ -119,6 +119,28 @@
                 android:visibility="invisible"/>
         </RadioGroup>
 
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textStyle="bold"
+            android:text="@string/settings_signature" />
+
+        <EditText
+            android:id="@+id/settings_signature"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="20dp"
+            android:layout_marginTop="5dp"
+            android:inputType="textEmailAddress"
+            android:background="@drawable/textview_background"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="30dp"
+            android:layout_marginTop="5dp"
+            android:text="@string/settings_signature_desc"/>
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

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

@@ -61,6 +61,14 @@
 
     </ScrollView>
 
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:id="@+id/dialog_event_detail_type_signature"
+        android:layout_marginBottom="5dp"
+        android:visibility="gone"/>
+
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"