add changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## Released [0.1.0]
+### Added
+- 2D viewer
+- slice selection
+- time selection
+- axis selection
+- server selection
+- field selection
+- auro refresh
+- data range evaluation
+- palettes
+- min and max range selection
+- share current view
+- load settings from URL params
+- resolution selection
+- view selected resolutions
+- download selected resolutions
+- ViSUS server interface
+- datasets listing
+- MIDX listing support
+- external configuration file
+- volume slice render
+- full volume render