notes.md: Add book notes for Montevideo through Lagos

12-Addis Ababa/notes.md

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+`Taken verbatim from my notebook`
+# Page 1
+```
+Addis Ababa
+    format string vulns? (manual hint)
+    %n: store # chars printed into stack vaf
+        ? where ?
+        -> 2 prev characters??
+    30e0: flag location
+        lE: e0 30
+
+30e0: \0\0  n a  m e  : p  a s  s\0
+ argv [ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ]
+
+    addr  A   %n
+    e0 30 %n  %n
+    DEL 0 %n  %n
+
+```
+
+Editor's note:
+```
+    e030 256e 256e
+```