Add RESTclient example

[dorofeev22]

With RestTemplate and tests

[dorofeev22]

Logger it for example

    @Autowired
    private RestTemplate restTemplate;

    @PostConstruct
    public void createInterceptors() {
        List<ClientHttpRequestInterceptor> interceptors = new ArrayList<>();
        interceptors.add(new LoggingRequestInterceptor());
        restTemplate.setInterceptors(interceptors);
    }

https://stackoverflow.com/questions/7952154/spring-resttemplate-how-to-enable-full-debugging-logging-of-requests-responses