Add SimpleProgram

This is the example use in optimization site:
GUIDES/Introduction/GetStarted/<lang>/RunningProgram

examples/java/SimpleProgram.java

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+// Copyright 2018 Google LLC
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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.
+
+// [START program]
+import com.google.ortools.linearsolver.MPConstraint;
+import com.google.ortools.linearsolver.MPObjective;
+import com.google.ortools.linearsolver.MPSolver;
+import com.google.ortools.linearsolver.MPVariable;
+
+public class SimpleProgram {
+  static { System.loadLibrary("jniortools"); }
+
+  public static void main(String[] args) throws Exception {
+    MPSolver solver = new MPSolver("SimpleProgram",
+        MPSolver.OptimizationProblemType.valueOf("GLOP_LINEAR_PROGRAMMING"));
+    // Create the variables x and y.
+    MPVariable x = solver.makeNumVar(0.0, 1.0, "x");
+    MPVariable y = solver.makeNumVar(0.0, 2.0, "y");
+    // Create the objective function, x + y.
+    MPObjective objective = solver.objective();
+    objective.setCoefficient(y, 1);
+    objective.setMaximization();
+    // Call the solver and display the results.
+    solver.solve();
+    System.out.println("Solution:");
+    System.out.println("x = " + x.solutionValue());
+    System.out.println("y = " + y.solutionValue());
+  }
+}
+// [END program]