Added CHANGELOG.md

CHANGELOG.md

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+# Changelog
+All notable changes to SigmonLED-Arduino will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+SigmonLED-Arduino uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.2] - 2022-02-07
+### Fixed
+- On/Off commands not working when in Palette mode
+
+## [1.0.1] - 2022-02-06
+### Fixed
+- Incorrect number of arguments being read in some edge cases
+
+## [1.0.0] - 2022-02-05
+### Added
+- New palette mode: static. This simply distributes the palette across the entire LED strip depending on the Palette Stretching.
+- On/Off color storing. You can now define a color to use when running the "Wake" command
+### Changed
+- Most commands take in binary arguments instead of ASCII to reduce transmission size.
+- All commands must end in `\n` to be recognized.
+- Linear blending is now separated from the palette command.
+- Brightness command now only affects palette modes.
+- Static Color is now defined by a single command rather than three.
+- All numbers are now sent as binary rather than ASCII hexadecimal
+- Palette Mode is now determined by a separate command
+
+## [0.4.1] - 2021-12-31
+### Fixed
+- Potential lockout bug. If there is no comms for 3 minutes, SigmonLED disconnects anything connected to the bluetooth module
+
+## [0.4.0] - 2021-04-09
+### Added
+- Palette Stretch setting. use s# to change (where # is a single-digit hexadecimal number)
+
+## [0.3.0] - 2021-03-26
+### Added
+- Ability to upload custom made palettes. See `README.md` for instructions on how to upload and show a custom palette
+### Removed
+- A bunch of debug output to serial
+### Changed
+- Colors are now received as hexadecimal.
+- LEDs are now set on a timer rather than a delay. This will make commands much more responsive.
+
+
+## [0.2.0] - 2021-02-15
+### Added
+- This Changelog :)
+- Solid palette mode. Use `P` command to activate