added changelog

docs/CHANGES.md

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+# CHANGELOG
+This document summarizes main and fixes changes published in stable (aka `main`) branch of this project.
+Ongoing work and development releases are under `develop` branch.
+
+## 0.22.0
+
+### main features
+* Service Mesh support -- mizu is now capable to tap mTLS traffic between pods connected by Istio service mesh
+  * Use `--service-mesh` option to enable this feature
+* New installation option - have the same Mizu functionality as long living pods in your cluster, with password protection.
+  * To install use `mizu install` command
+  * To access use `mizu view` or `kubectl -n mizu port-forward svc/mizu-api-server`
+  * To uninstall run `mizu clean`
+* At first login
+  * set admin password as prompted, use it to login to mizu later on.
+  * after login, user should select cluster namespaces to tap: by default all namespaces in the cluster are selected, user can select/unselect according to their needs. These settings are retained and can be modified at any time via Settings menu (cog icon on the top-right)
+
+
+### improvements
+* improved Mizu permissions/roles logic to support clusters with strict PodSecurityPolicy (PSP) -- see [PERMISSIONS](PERMISSIONS.md) doc for more details
+ 
+
+### notable bug fixes
+* mizu now works properly when API service is exposed via HTTPS url
+* mizu now properly displays KAFKA message body 
+
+
+
+
+## 0.21.0
+
+### main features
+* New traffic search & stream exprience
+* Rich query language with full-text search capabilities on headers & body
+* Distinct live-streaming vs paging/browsing modes, all with filter applied
+
+### improvements
+* GUI - source and destination IP addresses & service names for each traffic item
+* GUI - Mizu health - display warning sign in top bar when not all requested pods are successfully tapped
+* GUI - pod tapping status reflected in the list (ok or problem)
+* Mizu telemetry - report platform type
+
+### fixes
+* Request duration and body size properly shown in GUI (instead of -1)