checkpoint 1990 Makefiles

Added Makefiles for 1990 entries.

In a some cases the source code was modified.

Modified 1990 README.md files.

In some cases the program still cannot be compiled.

1990/baruch/README.md

@@ -1,4 +1,4 @@
-Best Small Program:
+# Best Small Program
 
 	Doron Osovlanski
 	CADTECH - CAD/CAM Systems Ltd
@@ -12,22 +12,24 @@ Best Small Program:
 	Tel-Aviv
 	Israel
 
+## To build:
 
-Judges' comments:
+        make all
 
-    Compile.  Try:
+### To run
 
 	echo 4 | baruch
 	echo 7 | baruch
 
+## Judges' comments
+
     This program reads an integer between 4 and 99 from the stdin.
 
     NOTE: The original program did not have a newline at the end of
 	  the file.  We added a final newline to the file to make
 	  unpacking easy.
 
-
-Selected notes from the author:
+## Author's comments
 
     The goal of this work was to write a program that solves the
     classic n-queen problem, with a board size of up to 99x99, while