Add README.

README.md

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+# Troff template (batteries included)
+
+This repository is an introduction to the good old tools to produce documents:
+
+- `roff` as the language to describe documents (`groff` is the implementation)
+- `tbl` and **hdtbl** for tables
+- `pic` for drawing images
+- `grap` for drawing graphs
+- `refer` for handling references and bibliography
+- etc.
+
+It also includes a few examples of custom macros and images.
+
+Furthermore, this repository includes:
+
+- UTF-8 characters translation into ms macros (via a script)
+- source code highlight (via the `source-highlight` software and a script)
+- A makefile to automatically call every tool in right order; just type `make`!
+
+# Preview
+
+https://t.karchnu.fr/doc/grofftut.pdf
+
+# Limitations
+
+Images are poorly handled, and they aren't easily managed with `roff` by default.
+Some macros exist to do it properly, but it still is to include in custom macros then to document.