Add some prose about PCS/Geneva

Copied and lightly edited from
https://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/lang/scheme/impl/pcscheme/0.html

www/index.html

@@ -49,10 +49,23 @@
   information, contact IBUKI, PO Box 1627, Los Altos, CA 94022,
   phone 415-961-4996, fax 415-961-8016, email rww@ibuki.com.</p>
   <h2>University of Geneva</h2>
-  <p>The University of Geneva produced a cleaned up implementation
+  <p>PCS/Geneva is a Scheme interpreter/compiler developed at the
-  of the public version and have called it PCS/Geneva. PCS/Geneva
+  University of Geneva. It is based on Texas Instrument's PC Scheme
-  is also available from this directory.</p>
+  (version 3.03) but differs somewhat from the original. The main
-  <hr>
+  extensions to PC Scheme are 486 support, BGI graphics, LIM-EMS
-  <pre>CD-ROM: Prime Time Freeware for AI, Issue 1-1</pre>
+  pagination support, line editing, mouse support, assembly-level
+  interfacing, and several powerful Scheme-oriented editors. (TI's
+  PC Scheme gives users full Revised^3 support along with many
+  primitives for DOS, Graphics and Text Windows. A powerful
+  built-in optimizing compiler produces fast code.)</p>
+  <p>This product may be distributed freely and used without
+  restrictions except for military purposes.</p>
+  <p>Authors: Larry Bartholdi and Marc Vuilleumier, C.U.I. - Scheme
+  group, University of Geneva, Switzerland</p>
+  <h3>Version 4.02PL1 (1994-01-11)</h3>
+  <p>PCS/Geneva has been tested on XTs, ATs, AT386s and AT486s
+  under various DOS and OS/2 versions. It even runs on
+  Hewlett-Packard's HP95LX. It also runs on Suns with a DOS
+  emulator.</p>
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