Ignore the byproducts of SGML/XML conversions for now.
diff --git a/Doc/api/.cvsignore b/Doc/api/.cvsignore
new file mode 100644
index 0000000..b158d57
--- /dev/null
+++ b/Doc/api/.cvsignore
@@ -0,0 +1,3 @@
+*.esis
+*.sgml
+*.xml