Add changelog info to docs and contribution guide (operator-framework#5093)

* Add changelog info to docs and contribution guide

Signed-off-by: Ish Shah <[email protected]>

* Address comments

Signed-off-by: Ish Shah <[email protected]>

Author: Ish Shah

CONTRIBUTING.MD

@@ -64,8 +64,13 @@ The first line is the subject and should be no longer than 70 characters, the se
 
 Most contributions involve some sort of documentation. See our [doc contribution guidelines][doc-contrib] for details.
 
+## Changelog
+
+The operator-sdk maintains a changelog and most contributions should involve a changelog entry. See our [changelog contribution guidelines][changelog-contrib] for details.
+
 [operator_framework]: https://groups.google.com/forum/#!forum/operator-framework
 [developer-guide]: https://sdk.operatorframework.io/docs/contribution-guidelines/developer-guide/
 [reporting-issues]: https://sdk.operatorframework.io/docs/contribution-guidelines/reporting-issues/
 [golang-style-doc]: https://github.com/golang/go/wiki/CodeReviewComments
-[doc-contrib]:https://sdk.operatorframework.io/docs/contribution-guidelines/documentation
+[doc-contrib]: https://sdk.operatorframework.io/docs/contribution-guidelines/documentation
+[changelog-contrib]:https://master.sdk.operatorframework.io/docs/contribution-guidelines/changelog

website/content/en/docs/contribution-guidelines/changelog.md

@@ -0,0 +1,18 @@
+---
+title: Changelog
+weight: 25
+---
+
+The Operator SDK project tracks changes across releases by maintaining a live changelog. This changelog is compiled via fragments located in `changelog/fragments`
+
+Contributors are asked to add these changelog fragments when creating pull requests by following this [template][changelog-template].
+
+The changlog fragments document the following information:
+
+* Description of Changes
+* Types of Changes
+  * One of: addition, change, deprecation, removal, bugfix
+* Migration Guide for Changes
+  * These are required for breaking changes, and essential (but not required) for scaffolding-related changes.
+
+[changelog-template]: https://github.com/operator-framework/operator-sdk/blob/master/changelog/fragments/00-template.yaml