Adds start to readme

Author: Jab2870

README.md

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+# Redcentric's Pandoc Filters
+
+This repository represents a number of [Pandoc
+Filters](https://pandoc.org/lua-filters.html) that can be used to generate
+documentation. These filters allow for files written in Markdown, too be
+converted into \LaTeX using Pandoc, which can then be used to produce a PDF.
+