Add changelog

CHANGELOG-1.x.md

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+## 1.2 Minor style tweaks and functionality additions (2017-03-09)
+
+Tag: [1.2](https://github.com/PatternBuilder/pattern-kit/releases/tag/V1.2)
+
+- Change rendering of the styleguide documentation to lean on bootstrap column grid
+- Add logic to render only the tabs that work for a particular atom based on what data is present
+- Add alert messaging for atoms in the preview area to flag that it will not render
+- Reduce and organize CSS with section comments for clarity
+- Add color to the nesting of the schema editor
+- Increase size of buttons for better accessibility for those of us with poor vision :D
+- Add ability to designate order on documentation in the markdown and render the secondary nav in that order
+- Update jQuery package to reference CDN for consistency
+
+
+## 1.0 support-at-data-and-yaml (2016-08-01)
+
+Tag: [1.0](https://github.com/PatternBuilder/pattern-kit/tree/V1.1)
+
+Now supporting YAML files for docs using the same basename as JSON. Also supporting @data to reference other component's doc data file. So @component would import component.docs.json or component.docs.yaml into your data file.
+
+
+## 1.0 Initial Release (2016-06-13)
+
+Tag: [1.0](https://github.com/PatternBuilder/pattern-kit/tree/V1.0)