validator release schedule (#32878)

* validator release schedule

* file

* remove toc

contributing/release-schedule.md

@@ -12,6 +12,8 @@
 
 A new release of AMP is pushed to all AMP pages every week on Tuesday. **Once a change in AMP is merged into the master branch of the amphtml repository, it will typically take 1-2 weeks for the change to be live for all users.**
 
+The [AMPHTML Validator](https://github.com/ampproject/amphtml/tree/master/validator#amp-html--validator) has it's own [Release Schedule](validator-release-schedule.md)
+
 ## Release Channels
 
 The AMP runtime and extensions are provided through a variety of different _release channels_. Each channel serves a purpose for developers and for the AMP HTML Project itself. See the [release cadence section](#release-cadence) for a more detailed breakdown of how and when code from the [`ampproject/amphtml`](https://github.com/ampproject/amphtml) repository makes it into release builds.

contributing/validator-release-schedule.md

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+# Validator Release Schedule
+
+A new release of the [AMPHTML Validator](https://github.com/ampproject/amphtml/tree/master/validator#amp-html--validator) is pushed to [cdn.ampproject.org/v0/validator.js](https://cdn.ampproject.org/v0/validator.js) roughly every week and typically on Tuesdays.
+
+The release of [AMP](https://github.com/ampproject/amphtml#amp-) has it's own [Release Schedule](https://github.com/ampproject/amphtml/blob/master/contributing/release-schedule.md).
+
+### Release Freezes
+
+There are occasions when we will skip a release of the AMPHTML Validator to production, known as a release freeze.
+
+A release freeze may happen due to:
+
+-   Times when there are not enough people available to push the AMPHTML Validator to production and monitor it. Currently, most of the people performing releases are based in the United States, so this will usually be the weeks of the major US holidays:
+    -   Independence Day (July 4)
+    -   Thanksgiving (fourth Thursday in November)
+    -   Between Christmas (25 December) and New Year's Eve/Day (December 31/January 1)
+
+In all cases, except emergencies, the release freezes will be announced at least one month in advance.
+
+Note that unless otherwise announced a release freeze does not imply a code freeze. Code may still be written, reviewed and merged during a release freeze.