Add test/data/archive.*

$ 7z a     archive.7z \
    artificial/0.bytes github-tags.json hello.sh non-ascii/αβ.txt \
    non-ascii/😻.txt pjw-thumbnail.png romeo.txt romeo.txt.gz
$ zip      archive.zip     etc etc
$ rar a    archive.rar     etc etc
$ tar cvf  archive.tar     etc etc
$ tar cvjf archive.tar.bz2 etc etc
$ tar cvzf archive.tar.gz  etc etc
$ lcab etc etc archive.cab

And after curating a data/ directory (without non-ascii/😻.txt):

$ genisoimage -v -J -r -V WUFFS_TEST_DATA_SUBSET -o archive.iso data/
diff --git a/test/data/README.md b/test/data/README.md
index 7608679..f424906 100644
--- a/test/data/README.md
+++ b/test/data/README.md
@@ -24,6 +24,12 @@
 
 ---
 
+The non-ascii directory holds trivial UTF-8 (but not ASCII) text files.
+
+---
+
+`archive.*` archives a subset of other files in this directory.
+
 `animated-red-blue.gif` is an original animation by Nigel Tao
 <nigeltao@golang.org>.
 
@@ -60,6 +66,8 @@
 [www.metmuseum.org](http://www.metmuseum.org/art/collection/search/436532)
 lists that image as in the public domain.
 
+`hello.sh` is a trivial shell script.
+
 `hibiscus.regular.*` are various encodings of a photo of "Hibiscus and Parrots"
 by Louis Comfort Tiffany, held by the Metropolitan Museum of Art.
 [www.metmuseum.org](http://www.metmuseum.org/art/collection/search/13503) lists
diff --git a/test/data/archive.7z b/test/data/archive.7z
new file mode 100644
index 0000000..d7417e8
--- /dev/null
+++ b/test/data/archive.7z
Binary files differ
diff --git a/test/data/archive.cab b/test/data/archive.cab
new file mode 100644
index 0000000..3eb094a
--- /dev/null
+++ b/test/data/archive.cab
Binary files differ
diff --git a/test/data/archive.iso b/test/data/archive.iso
new file mode 100644
index 0000000..07c9780
--- /dev/null
+++ b/test/data/archive.iso
Binary files differ
diff --git a/test/data/archive.rar b/test/data/archive.rar
new file mode 100644
index 0000000..c08931a
--- /dev/null
+++ b/test/data/archive.rar
Binary files differ
diff --git a/test/data/archive.tar b/test/data/archive.tar
new file mode 100644
index 0000000..bedf0fb
--- /dev/null
+++ b/test/data/archive.tar
Binary files differ
diff --git a/test/data/archive.tar.bz2 b/test/data/archive.tar.bz2
new file mode 100644
index 0000000..ac37faa
--- /dev/null
+++ b/test/data/archive.tar.bz2
Binary files differ
diff --git a/test/data/archive.tar.gz b/test/data/archive.tar.gz
new file mode 100644
index 0000000..bb481df
--- /dev/null
+++ b/test/data/archive.tar.gz
Binary files differ
diff --git a/test/data/archive.zip b/test/data/archive.zip
new file mode 100644
index 0000000..af160b1
--- /dev/null
+++ b/test/data/archive.zip
Binary files differ
diff --git a/test/data/hello.sh b/test/data/hello.sh
new file mode 100755
index 0000000..db0f9d4
--- /dev/null
+++ b/test/data/hello.sh
@@ -0,0 +1,20 @@
+#!/bin/bash -eu
+# Copyright 2021 The Wuffs Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ----------------
+
+# This file should have the "executable" Unix permission bit.
+
+echo hello
diff --git "a/test/data/non-ascii/\316\261\316\262.txt" "b/test/data/non-ascii/\316\261\316\262.txt"
new file mode 100644
index 0000000..19ae7fb
--- /dev/null
+++ "b/test/data/non-ascii/\316\261\316\262.txt"
@@ -0,0 +1,2 @@
+α U+03B1 GREEK SMALL LETTER ALPHA. UTF-8: [C3 B1].
+β U+03B2 GREEK SMALL LETTER BETA.  UTF-8: [C3 B2].
diff --git "a/test/data/non-ascii/\360\237\230\273.txt" "b/test/data/non-ascii/\360\237\230\273.txt"
new file mode 100644
index 0000000..98aeba7
--- /dev/null
+++ "b/test/data/non-ascii/\360\237\230\273.txt"
@@ -0,0 +1,3 @@
+😻 U+1F63B SMILING CAT FACE WITH HEART-SHAPED EYES. UTF-8: [F0 9F 98 BB].
+
+This code point is outside of the Unicode BMP (Basic Multilingual Plane).
diff --git a/test/data/romeo.txt.bz2 b/test/data/romeo.txt.bz2
new file mode 100644
index 0000000..e272835
--- /dev/null
+++ b/test/data/romeo.txt.bz2
Binary files differ