README.md in currency_converter-0.0.1 vs README.md in currency_converter-0.0.2

@@ -16,14 +16,29 @@
 
     $ gem install currency_converter
 
 ## Usage
 
-TODO: Write usage instructions here
+To convert between two currencies:
 
+    CurrencyConverter.exchange("EUR", "USD", 100)
+    => 132.89
+
+    CurrencyConverter.exchange("USD", "EUR", 100)
+    => 75.15
+
+To get the most recent exchange rate between two currencies:
+
+    CurrencyConverter.exchange("EUR", "USD", 1)
+    => 1.33
+
+    CurrencyConverter.exchange("USD", "EUR", 1)
+    => 0.75
+
 ## Contributing
 
 1. Fork it
-2. Create your feature branch (`git checkout -b my-new-feature`)
-3. Commit your changes (`git commit -am 'Add some feature'`)
-4. Push to the branch (`git push origin my-new-feature`)
-5. Create new Pull Request
+2. Add tests for it.
+3. Create your feature branch (`git checkout -b my-new-feature`)
+4. Commit your changes (`git commit -am 'Add some feature'`)
+5. Push to the branch (`git push origin my-new-feature`)
+6. Create new Pull Request