chore(pandoc): add templates

pandoc/templates/default.asciidoc

@@ -0,0 +1,35 @@
+$if(titleblock)$
+$title$
+$if(author)$
+$for(author)$$author$$sep$; $endfor$
+$endif$
+$if(date)$
+$date$
+$endif$
+$if(keywords)$
+:keywords: $for(keywords)$$keywords$$sep$, $endfor$
+$endif$
+$if(toc)$
+:toc:
+$endif$
+
+$endif$
+$if(abstract)$
+[abstract]
+== Abstract
+$abstract$
+
+$endif$
+$for(header-includes)$
+$header-includes$
+
+$endfor$
+$for(include-before)$
+$include-before$
+
+$endfor$
+$body$
+$for(include-after)$
+
+$include-after$
+$endfor$