Add advert about Emacs Boost course

README.org

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+* ADVERT: Elevate Your Emacs Skills in Paris, Rotterdam, Leuven or Valencia!
+
+Unlock the power of Emacs in Paris!  Join my next *exclusive "Emacs Boost" course*
+on November 9th and 10th, 2023!
+
+Are you ready to *supercharge your productivity* and become an Emacs ninja?  Ready
+to become an Emacs pro?  Look no further!
+
+What you'll learn:
+
+- Master Emacs from the basics to advanced tricks.
+- Boost your editing efficiency and streamline your workflow.
+- Customize Emacs to fit your unique needs.
+- Collaborate with fellow Emacs enthusiasts.
+- And much more!
+
+#+begin_quote
+- When: November 9th and 10th (Thu and Fri)
+- Where: Paris, France
+- Who should attend: Anyone interested in Emacs, from beginners to advanced
+  users.
+#+end_quote
+
+Why choose my course?
+
+- Expert instructor with 24 years of Emacs experience.
+- Hands-on exercises to reinforce your learning.
+- Networking opportunities with like-minded Emacs enthusiasts.
+- Personalized attention.
+
+Don't miss this opportunity to take your Emacs skills to the next level! \\
+Seats are limited, so reserve yours today.
+
+Visit https://emacsboost.com/ for more information, other dates and other
+locations, and to *reserve your seat*.
+
+/See you in Paris!/  [[https://emacsboost.com/][#EmacsBoostParis]]
+
 * Overview
 
 ** Description