Update README.md

README.md

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 # LedgerStockUpdate
 
 This application locates any stocks you have in your [ledger-cli](ledger-cli.org) file, then generates a price database of those stocks compatible with the application.
+
+### Usage
+
+Build the go file, and run as follows:
+
+```bash
+./[name of executable] -f=[ledger file] -p=[price database file (to create or update)]
+```
+
+This should spit out a price database file, which can then be used to calculate the market value in ledger as follows:
+
+```bash
+ledger -f [ledger file] --price-db [price database file] -V bal
+```