Add documentation about how to use SimpleTableHeaderAdapter

Author: Ingo Schwarz

README.md

@@ -194,6 +194,32 @@ This view is automatically shown if no data is available and hidden if there is
 #### Header Data
 Setting data to the header views is identical to setting data to the table cells. All you need to do is extending the `TableHeaderAdapter` which is also providing the easy access methods that are described for the `TableDataAdapter`.  
 If all you want to display in the header is the column title as String (like in most cases) the `SimpleTableHeaderAdapter` will fulfil your needs.
+To show simple Strings inside your table header, use the following code:
+```
+public class MainActivity extends AppCompatActivity {
+    
+    private static final String[] TABLE_HEADERS = { "This", "is", "a", "test" };
+        
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        // ...
+        tableView.setHeaderAdapter(new SimpleTableHeaderAdapter(this, TABLE_HEADERS));
+    }
+}  
+```
+To show Strings from resources inside your table header, use the following code:
+```
+public class MainActivity extends AppCompatActivity {
+    
+    private static final int[] TABLE_HEADERS = { R.string.header_col1, R.string.header_col2, R.string.header_col3 };
+        
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        // ...
+        tableView.setHeaderAdapter(new SimpleTableHeaderAdapter(this, TABLE_HEADERS));
+    }
+}  
+```
 
 ### Interaction Listening
 #### Data Click Listening