changelog update

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2023-05-20
+
+### Added
+
+- New processes:
+    - `add`
+    - `array_element`
+    - `divide`
+    - `filter_bands`
+    - `filter_bbox`
+    - `filter_spatial`
+    - `filter_temporal`
+    - `load-collection`
+    - `max`
+    - `mean`
+    - `median`
+    - `merge_cubes`
+    - `min`
+    - `multiply`
+    - `ndvi`
+    - `reduce-dimension`
+    - `rename_dimension`
+    - `rename_labels`
+    - `rub_udf`
+    - `save_result`
+    - `substract`
+
+- Download formats:
+    - `GeoTIFF`
+    - `NetCDF`
+
+