firedrake: Add meta information

firedrake/default.nix

@@ -54,4 +54,10 @@ in
     ];
 
     patches = [ ./firedrake-setup.patch ];
+
+    meta = {
+      homepage = "http://www.firedrakeproject.org";
+      description = "Firedrake is an automated system for the portable solution of partial differential equations using the finite element method (FEM).";
+      license = licenses.gpl3;
+    };
   }