Added hello_world example

Author: Sebastiano Merlino

examples/hello_world.cpp

@@ -0,0 +1,36 @@
+#include <httpserver.hpp>
+
+using namespace httpserver;
+
+class hello_world_resource : public http_resource<hello_world_resource> {
+	public:
+        void render(const http_request&, http_response**);
+};
+
+//using the render method you are able to catch each type of request you receive
+void hello_world_resource::render(const http_request& req, http_response** res)
+{
+    //it is possible to send a response initializing an http_string_response
+    //that reads the content to send in response from a string.
+    *res = new http_string_response("Hello World!!!", 200);
+}
+
+int main()
+{
+    //it is possible to create a webserver passing a great number of parameters.
+    //In this case we are just passing the port and the number of thread running.
+	webserver ws = create_webserver(8080).max_threads(5);
+
+    hello_world_resource hwr;
+    //this way we are registering the hello_world_resource to answer for the endpoint
+    //"/hello". The requested method is called (if the request is a GET we call the render_GET
+    //method. In case that the specific render method is not implemented, the generic "render"
+    //method is called.
+    ws.register_resource("/hello", &hwr, true);
+
+    //This way we are putting the created webserver in listen. We pass true in order to have
+    //a blocking call; if we want the call to be non-blocking we can just pass false to the
+    //method.
+    ws.start(true);
+	return 0;
+}