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/distro-build/info.rkt

@@ -7,3 +7,7 @@
                "web-server-lib"
                "scribble-lib"
                "ds-store-lib"))
+
+(define pkg-desc "Tools for constructing a distribution of Racket")
+
+(define pkg-authors '(mflatt))