chore: Add Comet released artifacts and links to maven (apache#3291)

* chore: Add Comet released artifacts and links to maven

* chore: Add Comet released artifacts and links to maven

Author: comphead

README.md

@@ -22,13 +22,16 @@ under the License.
 [![Apache licensed][license-badge]][license-url]
 [![Discord chat][discord-badge]][discord-url]
 [![Pending PRs][pending-pr-badge]][pending-pr-url]
+[![Maven Central][maven-badge]][maven-url]
 
 [license-badge]: https://img.shields.io/badge/license-Apache%20v2-blue.svg
 [license-url]: https://github.com/apache/datafusion-comet/blob/main/LICENSE.txt
 [discord-badge]: https://img.shields.io/discord/885562378132000778.svg?logo=discord&style=flat-square
 [discord-url]: https://discord.gg/3EAr4ZX6JK
 [pending-pr-badge]: https://img.shields.io/github/issues-search/apache/datafusion-comet?query=is%3Apr+is%3Aopen+draft%3Afalse+review%3Arequired+status%3Asuccess&label=Pending%20PRs&logo=github
 [pending-pr-url]: https://github.com/apache/datafusion-comet/pulls?q=is%3Apr+is%3Aopen+draft%3Afalse+review%3Arequired+status%3Asuccess+sort%3Aupdated-desc
+[maven-badge]: https://img.shields.io/maven-central/v/org.apache.datafusion/comet-spark-spark4.0_2.13
+[maven-url]: https://search.maven.org/search?q=g:org.apache.datafusion%20AND%20comet-spark
 
 <img src="docs/source/_static/images/DataFusionComet-Logo-Light.png" width="512" alt="logo"/>