Start the rc template docs.

sites/werc.cat-v.org/docs/rc_template_lang.md

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+Rc template language
+====================
+
+Implemented by Kris, thanks!
+
+Basic syntax:
+
+* Lines starting with % are executed as rc commands, the resulting output is inserted in the document.
+* use %{ and %} to delimit multi line sections of rc code (note the lack of space between % and { or }!
+* To 'inline' the value of an environment variable use `%($my_var%)`
+
+That is basically it!