Add additional context and links to readme.

Readme.md

@@ -4,8 +4,13 @@
 This module provides deliberation tools for the
 [Guile](https://www.gnu.org/software/guile/) scheme version of
 [Goblins](https://spritely.institute/goblins/).
+The module uses the standard terminology and methods of
+[social choice theory](https://en.wikipedia.org/wiki/Social_choice_theory).
 Currently, this module provides ranked-chioce ballots and two ranked-choice
-voting systems: Instant-Runoff Voting, and the Borda count method.
+voting systems:
+[Instant-Runoff Voting](https://en.wikipedia.org/wiki/Instant-runoff_voting),
+and the
+[Borda count](https://en.wikipedia.org/wiki/Borda_count) method.
 These features should be considered experimental.
 
 ## Using Deliberate