add apply patch example

test/examples/diffutils/Example.java

@@ -0,0 +1,23 @@
+package diffutils;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Example {
+    public static List<String> fileToLines(String filename) {
+        List<String> lines = new LinkedList<String>();
+        String line = "";
+        try {
+            BufferedReader in = new BufferedReader(new FileReader(filename));
+            while ((line = in.readLine()) != null) {
+                lines.add(line);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return lines;
+    }
+}