Implemented a factorial program in the assembly

Very cool, easy, and reads well

examples/factorial.asm

@@ -0,0 +1,43 @@
+;;; factorai.asm: A program that generates the factorials of each
+;;;  number from 1 to 24 (24!~=UINT64_MAX).  Using the registers to
+;;;  store `n` and `n!`.
+
+  ;; Setup initial REG[0] = 1 and REG[1] = 1
+  push.word 1
+  mov.word 0
+  push.word 1
+  mov.word 1
+
+  ;; Print `REG[0]: REG[1]`
+  ;; Here is the loop back point `#`
+  push.byte '\t'
+  print.char
+  push.reg.word 0
+  print.word
+  push.byte ':'
+  print.char
+  push.byte ' '
+  print.char
+  push.reg.word 1
+  print.word
+  push.byte '\n'
+  print.char
+
+  ;;  REG[0] += 1
+  push.reg.word 0
+  push.word 1
+  plus.word
+  mov.word 0
+
+  ;;  REG[1] *= REG[0]
+  push.reg.word 0
+  push.reg.word 1
+  mult.word
+  mov.word 1
+
+  push.word 24
+  push.reg.word 0
+  gte.word
+  ;; Jump to `#`
+  jump.if.byte 4
+  halt