Add change log

CHANGELOG.md

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+### Changelog
+
+All notable changes to this project will be documented in this file. Dates are displayed in UTC.
+
+Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
+
+#### [v0.2.0](https://github.com/emit-sds/SpectralUnmixing/compare/v0.1.0...v0.2.0)
+
+> 6 June 2022
+
+- Wl checks [`#12`](https://github.com/emit-sds/SpectralUnmixing/pull/12)
+- updates to handle mixted micron and nm units [`74fb05d`](https://github.com/emit-sds/SpectralUnmixing/commit/74fb05db6b4605661e675fb184fa84fba1245ad7)
+- Update version to 0.2.0 [`a6a90b5`](https://github.com/emit-sds/SpectralUnmixing/commit/a6a90b5246636b7781debf808c152040159804dd)
+
+#### v0.1.0
+
+> 2 May 2022
+
+- one-sample files [`#10`](https://github.com/emit-sds/SpectralUnmixing/pull/10)
+- ImgSPEC Merge [`#6`](https://github.com/emit-sds/SpectralUnmixing/pull/6)
+- Restructure [`#7`](https://github.com/emit-sds/SpectralUnmixing/pull/7)
+- update package file links, add Project and Manifest tomls [`d7869ae`](https://github.com/emit-sds/SpectralUnmixing/commit/d7869ae56d92da494e7cd5389ba8ea1a4c1d2662)
+- initial commit with some modification from base emit SDS L3 version.  Needs verification and project files [`26ee997`](https://github.com/emit-sds/SpectralUnmixing/commit/26ee997358ea0ddfc5287d9e5e934462d1005583)
+- update manifest and toml files [`d6b8e2c`](https://github.com/emit-sds/SpectralUnmixing/commit/d6b8e2c8ee54b60d8b73582e61d474441af219a5)