Add vert-x template

[alexellis]

Based upon the existing java8/11 template and the work of @k33g

https://gitlab.com/openfaas-experiments/java-8-vert-x-template/

Signed-off-by: Alex Ellis (OpenFaaS Ltd) alexellis2@gmail.com

Example handler:

package com.openfaas.function;

import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.RoutingContext;
import io.vertx.ext.web.handler.BodyHandler;
import io.vertx.core.json.JsonObject;

public class Handler implements BodyHandler {

  @Override
  public void handle(RoutingContext routingContext) {
    routingContext.response()
      .putHeader("content-type", "application/json;charset=UTF-8")
      .end(
        new JsonObject()
          .put("status", "ok")
          .encodePrettily()
      );
  }

  @Override
  public BodyHandler setBodyLimit(long bodyLimit) {
    return null;
  }

  @Override
  public BodyHandler setUploadsDirectory(String uploadsDirectory) {
    return null;
  }

  @Override
  public BodyHandler setMergeFormAttributes(boolean mergeFormAttributes) {
    return null;
  }

  @Override
  public BodyHandler setDeleteUploadedFilesOnEnd(boolean deleteUploadedFilesOnEnd) {
    return null;
  }

}