Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All changes to TechnicFlux are documented here. The latest version is at the top.
+
+A version is marked as Unreleased if it is currently on the dev branch and is still undergoing development. It will be 
+assigned a version number and release date with the next release of TechnicFlux.  
+**Important:** When contributing, ensure that you update this file to include a list of all the changes that you have made.
+
+**Follow the below format for each new version:**
+```
+## [vX.X.X or 'Unreleased'] - yyyy-mm-dd
+
+Write a brief overview of the update and everything that is significant about it here.
+
+### Added
+- [#12](https://github.com/Zandercraft/TechnicFlux/issues/12) - 
+  Short description of feature added based on an issue. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+- Short description of feature added ([ZandercraftGames](https://github.com/ZandercraftGames)).
+
+### Changed
+- [#13](https://github.com/Zandercraft/TechnicFlux/issues/13) -
+  Short description of feature changed based on an issue. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+- Short description of feature changed. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+### Bug fixes
+- [#14](https://github.com/Zandercraft/TechnicFlux/issues/14) -
+  Short description of bug fixed based on an issue. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+- Short description of bug fixed. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+### Security
+- [CVE-123456](<CVE LINK>) -
+  Fixed a security vulnerability. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+### Deprecated
+- [#14](https://github.com/Zandercraft/TechnicFlux/issues/14) -
+  Short description of deprecated feature based on an issue. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+- Short description of deprecated feature. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+### Removed
+- [#15](https://github.com/Zandercraft/TechnicFlux/issues/15) -
+  Short description of feature removed based on an issue. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+- Short description of feature removed. ([ZandercraftGames](https://github.com/ZandercraftGames)).
+### Additional Update Instructions (only include if applicable)
+Here you would describe any additional instructions/steps required to update to this version of TechnicFlux and why they
+are necessary.
+1. Example step 1
+2. Example step 2
+```
+
+---