Add fastcopy emails to Zlib supplements

PiperOrigin-RevId: 433763944
diff --git a/v2/assets/Supplement/Zlib/fastcopy-emails.txt b/v2/assets/Supplement/Zlib/fastcopy-emails.txt
new file mode 100644
index 0000000..6103e62
--- /dev/null
+++ b/v2/assets/Supplement/Zlib/fastcopy-emails.txt
@@ -0,0 +1,2 @@
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu