Add illustration for lung base in README

Updated the README to include an illustration of the base of lungs.

Author: mhalle

PW44_2026_GranCanaria/Projects/HelpingLlmsViewIdcImages/README.md

@@ -60,10 +60,9 @@ Skill download: <https://github.com/mhalle/idc-series-preview/releases/latest/do
 
 # Illustrations
 
+"Find the bottom of the lungs in an IDC NLST series".
 
-_No response_
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+[Base of lungs](nlst_lung_bases_v070.jpg)
 
 # Background and References