poc: add tester for pandoc example

Co-authored-by: Roberto Abdelkader Martínez Pérez <robertomartinezp@gmail.com>

poc/examples/pandoc/testme

@@ -0,0 +1,8 @@
+#!/usr/bin/env sh
+
+curl -X POST --data-binary @- http://localhost:8080/convert/markdown/man <<EOF
+# This is not a pipe
+
+1. hello
+1. goodbye
+EOF