Added example demonstrating sf::VertexBuffer, sf::Shader and sf::Thread usage.

examples/island/CMakeLists.txt

@@ -0,0 +1,11 @@
+
+set(SRCROOT ${PROJECT_SOURCE_DIR}/examples/island)
+
+# all source files
+set(SRC ${SRCROOT}/Island.cpp)
+
+# define the island target
+sfml_add_example(island GUI_APP
+                 SOURCES ${SRC}
+                 DEPENDS sfml-graphics sfml-window sfml-system
+                 RESOURCES_DIR resources)