notes.md: Add book notes for 20-Vancouver

20-Vancouver/notes.md

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+`Taken verbatim from my notebook`
+# Page 1
+```
+Vancouver   ✓
+    Reads 0x400 B -> 2400 (payld)
+
+    payld[0] -> r11 ;
+    swpb r11        ; BE to LE conversion
+    payld[1] -> r15 ;
+    bis  r15, r11   ;
+
+    payld[2] -> r10 ; size
+    cmp  #2,  r10   ; if size <= 2
+    execute debug payload
+
+    gg ez   mov  #ff00, r15
+            mov  r15,   sr
+            call #10
+
+debug payload
+    [loadaddr][size][payload...]
+     8000      04    f40000ff
+
+    44b2 04 3f40 00ff [contents at 44b6]
+```
+
+# Editor's note:
+For size's sake, the payload reuses some code to call INT after setting sr to ff00
+
+The actual payload is "44b2043f5000ff"