Update README.md

Author: sedabasaran

README.md

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-# SpringBootRestClient
+# SpringBootRestClient RestClient
+The RestClient is a synchronous HTTP client that offers a modern, fluent API. It offers an abstraction over HTTP libraries that allows for convenient conversion from a Java object to an HTTP request, and the creation of objects from an HTTP response.
+
+# This project uses JSONPlaceholder.
+JSONPlaceholder is a free online REST API that you can use whenever you need some fake data.
+
+![Ekran Resmi 2024-04-24 18 10 47](https://github.com/sedabasaran/restClient/assets/58148544/92617efa-0824-4f59-bdaa-092693c9af88)
+
+![Ekran Resmi 2024-04-24 18 11 58](https://github.com/sedabasaran/restClient/assets/58148544/3be891e1-a71a-459d-9e35-75ac4197568a)
+
+![Ekran Resmi 2024-04-24 18 09 04](https://github.com/sedabasaran/restClient/assets/58148544/cab6062d-c0c6-4ce0-9ecf-ff0df590e7eb)