Add license boiler plate

examples/java/FlowExample.java

@@ -10,13 +10,17 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-package com.google.ortools.java;
+
+package com.google.ortools.samples;
 
 import com.google.ortools.Loader;
 import com.google.ortools.graph.MaxFlow;
 import com.google.ortools.graph.MinCostFlow;
 
-/** Sample showing how to model using the flow solver. */
+/**
+ * Sample showing how to model using the flow solver.
+ *
+ */
 public class FlowExample {
   private static void solveMinCostFlow() {
     System.out.println("Min Cost Flow Problem - Simple interface");