Feat: Add Dataset Structure

tools/templates/README.tmpl

@@ -154,6 +154,18 @@ config_names:
 
 ## Dataset Structure
 
+All files use a revised version of [the CoNLL-X
+format](http://anthology.aclweb.org/W/W06/W06-2920.pdf) called CoNLL-U.
+Annotations are encoded in plain text files (UTF-8, [normalized to
+NFC](http://unicode.org/reports/tr15/), using only the LF character as line
+break, including an LF character at the end of file).
+
+Revision (r{{ ud_ver }}) specific documentation is available here:
+* https://github.com/UniversalDependencies/docs/blob/r{{ ud_ver }}/format.md
+
+The latest UD CoNLL-U Format documentation is available here:
+* https://universaldependencies.org/format.html
+
 ### Data Instances
 
 [More Information Needed]