doc(changelog): changelog for release v0.5.0 (#69)

Signed-off-by: mayank <[email protected]>

Author: mynktl

CHANGELOG.md

@@ -1,4 +1,6 @@
-# Changelog
-
-Under development.
-
+0.5.0 / 2021-07-16
+========================
+* adding metrics for nfs-provisioner ([#51](https://github.com/openebs/dynamic-nfs-provisioner/pull/51),[@mynktl](https://github.com/mynktl))
+* support to access nfs-share volume by non-root application ([#52](https://github.com/openebs/dynamic-nfs-provisioner/pull/52),[@mittachaitu](https://github.com/mittachaitu))
+* support to provision nfs resources in user provided namespace ([#58](https://github.com/openebs/dynamic-nfs-provisioner/pull/58),[@mynktl](https://github.com/mynktl))
+* support to specify node affinity rules of NFS Server ([#59](https://github.com/openebs/dynamic-nfs-provisioner/pull/59),[@mittachaitu](https://github.com/mittachaitu))