update README with problem description

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-# InventorySim
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+# InventorySim
+
+Simulates an single-warehouse inventory management system that handles these 
+edge cases by preventing inventory oversells under load.
+
+## Problem
+
+Inventory management systems are an intriguing area for system designs. They
+must follow strict rules for how inventory is added, removed, and transferred
+between locations in a warehouse. Without careful handling, stock can be
+purchased that doesn't exist.
+
+For instance, a high traffic item can sell out quickly, but how can you prevent
+two users from purchasing the last item at the same time? Race conditions happen
+when multiple requests read and write the same inventory row at the same time.
+Two customers can read only one unit of milk is available, both reserve it, and
+the system oversells.