Adding ratpack module (#1374)

* adding ratpack module

* adding pom.xml

ratpack/src/main/java/com/baeldung/Application.java

@@ -0,0 +1,22 @@
+package com.baeldung;
+
+import ratpack.http.MutableHeaders;
+import ratpack.server.RatpackServer;
+
+public class Application {
+
+	public static void main(String... args) throws Exception {
+		RatpackServer.start(server -> server.handlers(chain -> chain.all(ctx -> {
+			MutableHeaders headers = ctx.getResponse().getHeaders();
+			headers.set("Access-Control-Allow-Origin", "*");
+			headers.set("Accept-Language", "en-us");
+			headers.set("Accept-Charset", "UTF-8");
+			ctx.next();
+		})
+		.get(ctx -> ctx.render("Welcome to baeldung ratpack!!!"))
+		.get(":name", ctx -> ctx.render("Hello " + ctx.getPathTokens().get("name") + "!!!"))
+		.post(":amount", ctx -> ctx.render(" Amount $" + ctx.getPathTokens().get("amount") + " added successfully !!!"))
+		));
+	}
+
+}