Mermaid diagram for classes

README.md

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+# HateLace - A Simple Computer
+
+```mermaid
+classDiagram
+    class Computer {
+        - Memory memory
+        - Program program
+        + Computer(Memory Memory)
+        + void load(Program program)
+        + void run()
+    }
+    class Memory {
+        + abstract Word read(Address address)
+        + abstract int size()
+        + abstract void write(Address address, Word data)
+        + abstract void dump()
+    }
+    class ProgramCounter {
+        - int PC
+        - int SysTick
+        - boolean haltFlag
+        + ProgramCounter()
+        + ProgramCounter(int PC)
+        + int getPC()
+        + int getSysTicks()
+        + int incPC()
+        + int setPC(int PC)
+        + boolean halted()
+        + void halt()
+    }
+    class Program
+    class Instruction {
+        + abstract void execute(Memory memory, ProgramCounter pc)
+        # abstract String opcode()
+        # abstract Object[] operands()
+        + abstract String toString()
+    }
+    class ArrayList
+    class Word {
+        + abstract <T> T getValue()
+        + abstract Word add(Word other)
+        + abstract Word subtract(Word other)
+        + abstract Word multiply(Word other)
+        + abstract Word divide(Word other)
+        + abstract String toString()
+        + abstract boolean equals(Object other)
+    }
+    class Address {
+        - int address
+        + Address(int address)
+        + int getAddress()
+        + String toString()
+    }
+    class LongWord {
+        - Long value
+        + LongWord(Long value)
+        + Long getValue()
+        + Word add(Word other)
+        + Word subtract(Word other)
+        + Word multiply(Word other)
+        + Word divide(Word other)
+        + String toString()
+        + boolean equals(Object other)
+    }
+    class LongMemory {
+        - long[] memory
+        + LongMemory()
+        + LongMemory(int size)
+        + Word read(Address address)
+        + int size()
+        + void write(Address address, Word data)
+        + void dump()
+    }
+    Memory <|-- LongMemory
+    Word <|-- LongWord
+    Program <-- ArrayList
+    Program --|> Instruction
+    Program : +toString()
+    Computer --> Memory
+    Computer --> Program
+    Computer --> ProgramCounter
+```