add a test data file parser
This simple format will be used to store multiple syntaxes of the same message
so that test suites for different languages can reuse them
diff --git a/test_data/example.data b/test_data/example.data
new file mode 100644
index 0000000..ea2a0ae
--- /dev/null
+++ b/test_data/example.data
@@ -0,0 +1,17 @@
+# Comment outside section
+# Another comment
+
+# That was a blank line
+This is not a blank line
+-- section1
+abc def
+ghi
+-- section2
+123
+456 # comment
+# comment inside a section
+789
+-- binary
+00 01 02 03 04 05 06 07 # comment
+77 66 55 44 33 22 11 00
+ # comment in binary