Adding an errata doc.

Author: kiboneu

ERRATA.md

@@ -0,0 +1,14 @@
+This document contains errors found post-publication of the RPISEC MBE lecture
+slides. Please refer to it when reading or presenting the material.
+
+If you have found an error not listed here, feel free to submit a [github issue](https://github.com/RPISEC/MBE/issues)
+or [contact us](https://github.com/RPISEC/MBE#i-have-a-question-how-can-i-get-in-touch-with-you).
+
+### Lecture 07 - DEP and ROP
+
+I. Slides 17 - 20 "History of DEP"
+   - MPROTECT, SEGMEXEC and PAGEEXEC provided by grsecurity for the Linux kernel was released in October 1st, 2000
+
+### Lecture 09 - Address Space Layout Randomization (ASLR)
+I. Slade 27 "History of ASLR"
+   - ASLR provided by grsecurity for the Linux kernel was released in 2001

README.md

@@ -62,6 +62,8 @@ Lecture | Title | Topics
 14 | Exploitation on 64bit, ARM, Windows | Exploitation differences on other architectures & platforms
 15 | Automation & The Future of Exploitation | Fuzzing, taint analysis, dynamic instrumentation, SMT/SAT solvers
 
+*Refer to [ERRATA.md](https://github.com/RPISEC/MBE/blob/master/ERRATA.md) for slide corrections.*
+
 ### Lab Breakdown
 Lab | Topic | Corresponding Lectures
 --- | ----- | ----------------------