docs: Add some notes on scope

README.md

@@ -1,2 +1,16 @@
 # ac-nh-turnip-prices
 Price calculator/predictor for Turnip prices
+
+## Scope
+
+This tool is:
+- A predictor for future prices that week
+- Able to calculate probabilities for different futures
+- Able to show data from a query string
+- A single page web-based app
+
+This tool is not:
+- A calculator for how much money you'll make
+- A way to count your turnips
+- A way to store multiple people's islands
+- Something with a backend