add new changelog folder

changelog/0001.md

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+### Added
+
+- add a changelog folder and readme with guideline for new changelog system

changelog/README.md

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+### Changelogs
+
+Temporary folder to add new changes. Each change should go into a separate file
+(unless it makes sense to group some changes into one file, e.g. a story).
+During release the changes will be moved to CHANGELOG.md.
+
+Each file should follow one of the below naming patterns:
+
+- \<issue number>.md
+  or
+- \<story number>.md
+  or
+- \<pr number>.md
+  or
+- \<random number>.md if none of other apply
+
+The content of the file should look like this:
+
+```
+### <type of change>
+
+- description of the change in one or max two sentences (#<issue> or !<pr>)
+```
+
+< type of change > can be one of:
+
+- **Added** for new features.
+- **Changed**: for changes in existing functionality.
+- **Deprecated**: for soon-to-be removed features.
+- **Removed**: for now removed features.
+- **Fixed**: for any bug fixes.
+- **Security**: in case of vulnerabilities.
+
+
+## Example
+
+```
+### Fixed
+
+- improve userdashboard filter performance (#2449)
+```
+