Add notes on the release steps

MAINTAINERS.md

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+# Guide for maintainers of Jakarta Validation Specification
+
+This guide is intended for maintainers of Jakarta Validation,
+i.e. anybody with direct push access to the git repository.
+
+## Releasing 
+
+Release of a new Jakarta Validation version should be coordinated across the following repositories:
+
+- https://github.com/jakartaee/validation
+- https://github.com/jakartaee/validation-spec
+- https://github.com/jakartaee/validation-tck
+
+### Jakarta Validation API release
+
+This one **must** go first. The release job for this repository builds and publishes the Jakarta Validation API artifacts 
+to Maven Central. This job also updates and tags the repository.
+
+* Go to [Jakarta Validation API Release job](https://ci.eclipse.org/validation/view/Jakarta%20Validation%20API/job/jakarta-validation-api-publish-release/)
+* Pick the branch from which you are planing to perform a release.
+   - Run the `Build with Parameters` and fill out the form
+   - Publishing to Maven Central is automatic, so no extra steps are required at the moment.
+
+### Jakarta Validation Spec
+
+Specification **must** be "released" next. Release job for this repository does not actually publish the spec to the site
+it only generated the build artifacts that have to be pulled locally and used to create corresponding pull requests.
+This job also updates and tags the repository.
+
+* Update the changelog and what's new specification section first. 
+* Go to [Jakarta Validation Specification Release job](https://ci.eclipse.org/validation/view/Jakarta%20Validation%20Specification/job/jakarta-validation-spec-publish-release/)
+* Pick the branch from which you are planing to perform a release.
+    - Run the `Build with Parameters` and fill out the form
+    - Once the build is complete, download the generated artifacts
+
+### Jakarta Validation TCK
+
+Jakarta Validation TCK is next on the list. The release job for this repository builds and publishes the Jakarta Validation TCK artifacts
+to Maven Central, uploads the distribution packages to Eclipse downloads server.
+This job also updates and tags the repository.
+
+* Update Jakarta Validation API version in the POM dependencies
+* Update the audit.xml generated by the specification release.
+* Go to [Jakarta Validation TCK Release job](https://ci.eclipse.org/validation/view/Jakarta%20Validation%20TCK/job/jakarta-validation-tck-publish-release/)
+* Pick the branch from which you are planing to perform a release.
+    - Run the `Build with Parameters` and fill out the form
+    - Publishing to Maven Central is automatic, so no extra steps are required at the moment.
+
+### Jakarta Specifications update
+
+The final step is to update the [specification repository](https://github.com/jakartaee/specifications).
+
+* Create a pull request with the content generated by the specification release (e.g. https://github.com/jakartaee/specifications/pull/874)
+* Make sure to update the index file to point to the new versions of downloadable TCK bundles
+* Optionally, if the XSDs were updated or if it is the first release in the series, create a pull request to update the XSD
+following the instructions provided at https://jakartaee.github.io/platform/publish-xml-schemas