Add bill-splitting calculator

Projects/2-Intermediate/Bill-Splitting-Calculator.md

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+# Bill-Splitting Calculator
+
+**Tier:**: 2-Intermediate
+
+This app allows you to keep track of how to split a bill when eating out, taking into consideration factors like tipping, taxes, and if some people spent more than others.
+
+## User Stories
+
+-   [ ] User can keep track of how much each person owes them for the meal
+-   [ ] User can easily calculate how much to tip
+-   [ ] User can easily calculate how much they spent on the meal (with tip and taxes factored in)
+
+## Bonus Features
+
+-   [ ] User can upload a photo of the receipt for processing
+-   [ ] User can request payments from within the app interface
+
+## Useful links and resources
+https://www.forbes.com/sites/maggiemcgrath/2014/02/28/the-definitive-guide-to-splitting-the-dinner-bill/#47a46ec871a4
+
+## Example projects
+https://codepen.io/cphemm/pen/reNwWd
+https://codepen.io/amacher13/pen/ZEzNJbo