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

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

original commit: 057bfc2ea1a24e85ece2d5f85da30076643ea598

pkgs/rackunit-lib/info.rkt

@@ -4,3 +4,7 @@
 
 (define deps '("base"
                "data-lib"))
+
+(define pkg-desc "RackUnit testing framework")
+
+(define pkg-authors '(ryanc noel))