Reference.md

 ```mermaid
 
-erDiagram
-    CUSTOMER ||--o{ ORDER : places
-    ORDER ||--|{ LINE-ITEM : contains
-    CUSTOMER }|..|{ DELIVERY-ADDRESS : uses
+classDiagram
+Class01 <|-- AveryLongClass : Cool
+Class03 *-- Class04
+Class05 o-- Class06
+Class07 .. Class08
+Class09 --> C2 : Where am i?
+Class09 --* C3
+Class09 --|> Class07
+Class07 : equals()
+Class07 : Object[] elementData
+Class01 : size()
+Class01 : int chimp
+Class01 : int gorilla
+Class08 <--> C2: Cool label
 
 
 ```