docs: add README.md and write some links

Signed-off-by: Conrad Zelck <git@simpel.cc>

README.md

+
+
+## Links
+- [Pandoc]
+- [Pandoc installing instructions on github]
+- [How to create PDF with context]
+- [How to install context]
+- [How to increase security for pandoc on server]
+[Pandoc]:https://pandoc.org
+[Pandoc installing instructions on github]:https://github.com/jgm/pandoc/blob/main/INSTALL.md
+[How to create PDF with context]:https://pandoc.org/MANUAL#context
+[How to install context]:https://wiki.contextgarden.net/Installation
+[How to increase security for pandoc on server]:https://pandoc.org/chunkedhtml-demo/19-a-note-on-security.html