[mu-fidl] README.md

Change-Id: I3bdaf598d8497a806e260ba85dbffa461536de90
Reviewed-on: https://fuchsia-review.googlesource.com/c/fidl-misc/+/514081
Reviewed-by: Mitchell Kember <mkember@google.com>
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+### Example Use
+
+    $ swipl
+    ['fidl.pl'].
+    phrase(encode(struct([b1, b4])), E).
+
+### Links
+
+* [SWI Prolog][swiprolog]
+* [prolog :- tutorial][prolog_tutorial]
+* [Definite Clause Grammars][dcg_tutorial]
+* [A Prologue for Prolog][prologue_for_prolog]
+
+<!-- xrefs -->
+[swiprolog]: http://www.swi-prolog.org
+[prolog_tutorial]: https://www.cpp.edu/~jrfisher/www/prolog_tutorial/contents.html
+[dcg_tutorial]: http://www.pathwayslms.com/swipltuts/dcg/
+[prologue_for_prolog]: http://www.complang.tuwien.ac.at/ulrich/iso-prolog/prologue