adding changelog

CHANGELOG.md

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+<!-- markdownlint-disable MD013 -->
+<!-- markdownlint-disable MD024 -->
+
+<!--
+Changelogs are for humans, not machines.
+There should be an entry for every single version.
+The same types of changes should be grouped.
+The latest version comes first.
+The release date of each version is displayed.
+
+Usage:
+
+Change log entries are to be added to the Unreleased section. Example entry:
+
+* [#<PR-number>](https://github.com/umee-network/umee/pull/<PR-number>) <description>
+
+-->
+
+# CHANGELOG
+
+## Unreleased
+
+### Features
+
+New methods:
+
+- A..
+
+Extended types:
+
+New types:
+
+### Breaking Changes
+
+- B...
+
+### Bug Fixes