fix standard headers and header spacing in winner README.md files

1990/pjr/README.md

@@ -8,18 +8,21 @@ Farnborough\
 Hants GU14 7PL\
 England, U.K.
 
+
 ## To build:
 
 ```sh
 make all
 ```
 
+
 ## To use:
 
 ```sh
 ./pjr
 ```
 
+
 ## Judges' remarks:
 
 This program prints out a string.  Can you figure out how
@@ -72,6 +75,7 @@ Rot13:
     in the original program! I leave it as an intellectual exercise
     to the reader to find out what it is.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.