DOC: Add more explanantions to examples

Examples/CollisionDetection/BoxVsBoxMeshTest/BoxVsBoxMeshTestExample.cpp

@@ -174,6 +174,11 @@ main()
             viewer->addControl(keyControl);
         }
 
+        std::cout << "================================================\n";
+        std::cout << "Key i/j/k/u/o move the cube\n";
+        std::cout << "Key 1/2/3/4 rotate the cube\n";
+        std::cout << "================================================\n\n";
+
         driver->start();
     }
 

Examples/CollisionDetection/TriangleVsSphereTest/TriangleVsSphereTestExample.cpp

@@ -162,6 +162,10 @@ main()
             viewer->addControl(keyControl);
         }
 
+        std::cout << "================================================\n";
+        std::cout << "Key i/j/k/u/o move the triangle\n";
+        std::cout << "================================================\n\n";
+
         driver->start();
     }
 

Examples/CollisionDetection/TriangleVsTriangleTest/TriangleVsTriangleTestExample.cpp

@@ -170,6 +170,10 @@ main()
             viewer->addControl(keyControl);
         }
 
+        std::cout << "================================================\n";
+        std::cout << "Key i/j/k/u/o move the triangle\n";
+        std::cout << "================================================\n\n";
+
         driver->start();
     }
 

Examples/PBD/PBDInjection/PBDInjectExample.cpp

@@ -238,9 +238,10 @@ main()
             //tissueObj->getPbdModel()->getParameters()->m_dt = sceneManager->getDt();
             });
 
-        std::cout << "================================================" << std::endl;
+        std::cout << "================================================\n";
+        std::cout << "Key i/j/k/u/o move the needle in space \n";
         std::cout << "Key s : injection \n" << "Key a : deflation \n";
-        std::cout << "================================================" << std::endl << std::endl;
+        std::cout << "================================================\n\n";
 
         driver->start();
     }

Examples/PBDCutting/PBDCuttingExample.cpp

@@ -237,6 +237,10 @@ main()
             }
             });
 
+        std::cout << "================================================\n";
+        std::cout << "Key i cut the cloth.\n";
+        std::cout << "================================================\n\n";
+
         driver->start();
     }
     return 0;