Add readme

README.md

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+# Hello World Spring Boot Application
+
+This is a simple Spring Boot application that exposes a REST endpoint.
+
+## Prerequisites
+
+- JDK 21
+- Docker
+- Gradle
+
+## Build Instructions
+
+1. Clone the repository:
+    ```sh
+    git clone <repository-url>
+    cd <repository-directory>
+    ```
+
+2. Build the application using Gradle:
+    ```sh
+    ./gradlew build
+    ```
+
+3. Build the Docker image:
+    ```sh
+    docker build -t hello-world-spring-boot .
+    ```
+
+## Running the Application
+
+1. Run the Docker container:
+    ```sh
+    docker run -p 8080:8080 hello-world-spring-boot
+    ```
+
+2. The application will be available at `http://localhost:8080`.
+
+## Making a Request
+
+To test the application, you can make a GET request to the `/hello` endpoint:
+
+```sh
+curl http://localhost:8080/hello