docs: Add project overview to README.md

README.md

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-### CICD Pipeline for Java Gradle Application to deploy on Kubernetes Cluster
+### CICD Pipeline for Dockerize Java Springboot Gradle Application using Job and push Docker image to DockerHub 
+
+This is a sample project to demonstrate the CI/CD pipeline for a Java Springboot Gradle Application build uisng Jib and push Docker image to DockerHub. The pipeline is built using GitHub Workflow. The pipeline is triggered when a commit is made to the GitHub repository. The pipeline consists of the following stages:
+
+1. Checkout the code from GitHub repository
+2. Setup Java JDK 11
+3. Setup Gradle
+4. Build the Java Springboot Gradle Application
+5. Unit Test the Java Springboot Gradle Application
+6. Build the Docker image using Jib
+7. Push the Docker image to DockerHub
+
+The pipeline is defined in the file [action.yml](.github/workflows/action.yml)
+
+