add notificationservice-iter1 readme.md

notificationIter1README.md

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+# Notification Service
+
+This is a notification service built with Spring Boot and RabbitMQ. The service demonstrates the use of the Observer design pattern to send notifications via a RabbitMQ Fanout Exchange.
+
+## Prerequisites
+
+- Java 11 or higher
+- RabbitMQ server
+- Docker (optional, for running RabbitMQ)
+
+## Getting Started
+
+### Local running RabbitMQ(MacOS)
+install RabbitMQ server with:
+```
+brew install rabbitmq
+```
+start a local RabbitMQ node:
+```
+brew services start rabbitmq
+```
+stop a running node:
+```
+brew services stop rabbitmq
+```
+
+### Running RabbitMQ with Docker
+
+If you don't have RabbitMQ installed, you can run it using Docker:
+
+```bash
+docker run -d --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:3-management
+```
+Access the RabbitMQ management console at http://localhost:15672 with the default username and password (guest/guest)
+
+### Clone repository
+```
+git clone https://github.com/yourusername/notification-service.git
+cd notification-service
+```
+
+### Build & run the application
+1.Build the application
+```
+./gradlew build
+```
+2.Run the application
+```
+./gradlew bootRun
+```
+### Testing
+Use API client like Postman to send a POST request to /send-notification endpoint:
+
+URL: http://localhost:8081/send-notification
+Method: POST
+Body:
+Key:"message"
+Value:"Hello World"
+
+Check the logs of your Spring Boot application to see the received notifications