add pkg-desc' and pkg-authors' to each package

This information will be used to construct a catalog from the
package directories.

original commit: 057bfc2ea1

pkgs/compiler-lib/info.rkt

@@ -3,3 +3,7 @@
 (define collection 'multi)
 
 (define deps '("base"))
+
+(define pkg-desc "Racket compilation tools, such as `raco exe'")
+
+(define pkg-authors '(mflatt))