PLanning sheet initial commit

planning.md

@@ -35,11 +35,14 @@ return digit_names[number]
 ```
 
 ## Integers under 20
-If the integer is under 10, then use the procedure described above. 
-Otherwise, ... (this is where you take over!)
+digit_under_twenty_names = [
+    "ten", "eleven", "twelve", "thirteen", "fourteen", 
+    "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "Twenty"
+]
+return digit_under_twenty_names[number]
 
 ## Integers under 100
-
+im assumeing we will be using loops here?
 
 ## Integers under 1000