Transaction heatmap

This is github like heatmap app which presents transaction heatmap for entire year based on local transactions file for year 2019. The “redder” it is the higher the failed transaction by accumulated value for that day and the “greener” it is the higher the successful transaction by accumulated value for that day.

Things can be added:

1. Tooltip/popover to display the date on UI.
2. Color indicators to easily understand the map
3. Error Handling
4. Accessibily support
5. More tests