Added first command test to cabal metadata and repo.

pandoc.cabal

@@ -122,6 +122,7 @@ Extra-Source-Files:
                  -- tests
                  test/bodybg.gif
                  test/*.native
+                 test/command/*.md
                  test/docbook-reader.docbook
                  test/docbook-xref.docbook
                  test/html-reader.html

test/command/smart.md

@@ -0,0 +1,25 @@
+```
+% pandoc -f markdown+smart -t markdown-smart
+"hi"...dog's breath---cat 5--6
+^D
+“hi”…dog’s breath—cat 5–6
+```
+
+```
+% pandoc -f markdown+smart -t markdown+smart
+"hi"...dog's breath---cat 5--6
+^D
+"hi"...dog's breath---cat 5--6
+```
+
+When we render literal quotes without smart, we need to escape:
+
+```
+% pandoc -f markdown-smart \
+  -t markdown+smart
+"hi"...dog's breath---cat 5--6
+^D
+\"hi\"\...dog\'s breath\-\--cat 5\--6
+```
+
+