Add codeblock snippets

.vim/snips/pandoc.snippets

@@ -637,3 +637,19 @@ endsnippet
 snippet sketch "Link a sketch" i
 [$1](file:///home/h/sketches/$2)
 endsnippet
+
+snippet ` "Inline code" i
+`$1`$2
+endsnippet
+
+snippet ``` "Code block" i
+```${1:sh}
+$2
+```
+endsnippet
+
+snippet tex "Latex block (see latex filter)"
+```{.tex}
+$1
+```
+endsnippet