📝 Document TypeSpec reduction

Documents TypeSpec reduction in lines of code compared to Open API.

README.md

@@ -18,6 +18,14 @@
 
 I created this project to learn about TypeSpec through first-hand usage.
 
+The generated Open API 3 specification has 878 lines (with no blank lines) in a
+single file. The TypeSpec source has 493 lines (about ⅓ are blank lines for
+readability) split across 8 files for logical organization, which is a ~45%
+reduction in lines of code.
+
+If we ignore the imports, using statements, and blank lines within models, then
+the TypeSpec only has 353 lines. That means a 60% reduction in code to maintain.
+
 ## Getting started
 
 Follow these steps to consume the generated Open API specification for SWAPI.