Add maintenance notice to README - repository no longer actively main…

README.md

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+[![Contentstack](https://www.contentstack.com/docs/static/images/contentstack.png)](https://www.contentstack.com/)
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+**Note:** This app is no longer maintained. It remains available for reference. If you have questions regarding this, please reach out to our [support team](mailto:support@contentstack.com) and we will do our best to help!
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 ## Graphql-spring-boot-client example application
 
 ### Quick starter for graphql api integration in spring boot
 
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 Spring Boot is an open-source framework that allows Java developers to create production-grade Spring applications.
 
 This step-by-step guide details how to create a Java sample webapp via spring-boot. This app, powered by Contentstack GraphQL API to fetch content stored in Contentstack and display it on your application.
 
 ## Prerequisites
 
--   An IDE, for example, [IntelliJ IDEA](https://www.jetbrains.com/idea/download/) / [STS](https://spring.io/tools) / [VSCode](https://code.visualstudio.com/download) / [Ecllipse](https://www.eclipse.org/downloads/)
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--   [JDK 17 or later](https://www.oracle.com/in/java/technologies/downloads/#java17)
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--   Gradle 4+ or Maven 3.2+
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--   [Contentstack account](https://www.contentstack.com/login/)
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+- An IDE, for example, [IntelliJ IDEA](https://www.jetbrains.com/idea/download/) / [STS](https://spring.io/tools) / [VSCode](https://code.visualstudio.com/download) / [Ecllipse](https://www.eclipse.org/downloads/)
 
+- [JDK 17 or later](https://www.oracle.com/in/java/technologies/downloads/#java17)
 
+- Gradle 4+ or Maven 3.2+
 
+- [Contentstack account](https://www.contentstack.com/login/)
 
 ### Screenshots