Fix type safety issue

README.md

@@ -85,4 +85,16 @@ build
     - [ ] Custom data structures
     - [ ] Working with external libraries
 
+## Debugger
+
+Ground now has an inbuilt debugger. To access this debugger, insert the `PAUSE` instruction (no arguments required) into the program. This should bring you to an interactive prompt.
+
+Commands:
+
+* continue: Continues execution of the program
+* exit: Stops execution of the program early
+* dump: Shows all variables and their contents
+* inspect (variable): Shows the contents of a variable
+* eval (code): Runs Ground code in the current scope
+* help: Shows a help message