Created changelog format (markdown)

changelog-format.md

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+## Changelog format
+#### Sometimes there will be fixes that don't have an issue, in such cases please be as descriptive as possible.
+
+
+### Security
+  * Fixed \<issue link>, impact <[vulnerability score](https://www.first.org/cvss/calculator/3.0)>
+  *
+
+### Fixed
+  * Fixed \<issue link>
+  *
+
+### Deprecated
+  * Deprecated `<name>` from `<module path>`
+  *
+
+### Changed
+  * Changed `<item changed>` to \[\<verb>] \<new behavior> instead of \<old behavior>
+  *
+
+### Added
+  * Added `<item added>` to `<context (API commands, file path, etc)>`
+  *
+
+### Removed
+  * Removed `<item or file>` from `<module or directory>`
+  *