add changelog for v0.5 (#102)

Signed-off-by: Yang Le <[email protected]>

Author: elgnay

CHANGELOG/CHANGELOG-v0.5.md

@@ -0,0 +1,21 @@
+# Changelog since v0.4.0
+All notable changes to this project will be documented in this file.
+
+## v0.5.0
+
+### New Features 
+* Support delete option. User is able to specify the deletion propagation strategy for resources in a manifestwork by setting `DeleteOption` in the spec of the manifestwork. ([#90](https://github.com/open-cluster-management-io/work/pull/90) [@qiujian16](https://github.com/qiujian16))
+
+### Added
+* Add generation in manifestwork status. ([#95](https://github.com/open-cluster-management-io/work/pull/95) [@qiujian16](https://github.com/qiujian16))
+
+### Changes
+* Upgrade library-go and api. ([#96](https://github.com/open-cluster-management-io/work/pull/96) [@qiujian16](https://github.com/qiujian16))
+* Reduce the numbe of GET request of manifestwork. ([#98](https://github.com/open-cluster-management-io/work/pull/98) [@elgnay](https://github.com/elgnay))
+
+### Bug Fixes
+* Resolve apply conflict. ([#89](https://github.com/open-cluster-management-io/work/pull/89) [@qiujian16](https://github.com/qiujian16))
+* Fix owners merge in apply unstructured. ([#99](https://github.com/open-cluster-management-io/work/pull/99) [@qiujian16](https://github.com/qiujian16))
+
+### Removed & Deprecated
+N/C