#1113 Link uml-reverse-mapper created class diagrams to readme, where needed

interpreter/README.md

@@ -15,6 +15,7 @@ Given a language, define a representation for its grammar along
 with an interpreter that uses the representation to interpret sentences in the
 language.
 
+## Class diagram
 ![alt text](./etc/interpreter_1.png "Interpreter")
 
 ## Applicability