added changelog

CHANGELOG.md

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+**Icons refreshed/updated: August 1st 2020**
+
+- Reorg and rename!
+- Added the new official icon set from the Azure Architecture Center
+- Renamed the previous 'azure-icons' set to 'azure-cds', and the above Azure Architecture Center icons are now called 'azure-icons'. This is confusing, sorry!
+- Removed the 'cloud-old' set, no one should need this now.
+  
+**Icons refreshed/updated: July 26th 2020**
+
+- HUGE UPDATE! 😁
+- New 'Cloud Design Studio' icon set added with all official Azure icons in new style
+- All Azure Docs icons refreshed with the new Azure branding / style
+- All Azure Patterns icons refreshed with the new Azure branding / style
+- Azure Patterns icons now have names!