add command to shrink pdf

README.md

@@ -217,8 +217,10 @@ make html
 # For watched html automatic building
 make html-watch
 
-# For pdf output run:
+# For pdf output
 make latexpdf
+# To shrink size of pdf
+gs -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -q -o iew-Server_-_User-Guide_small.pdf View-Server_-_User-Guide.pdf
 ```
 
 The documentation is generated in the respective *_build/html* directory.