Add Readme

Author: pathawks

README.markdown

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+# StarExec
+## Web Interface
+
+This is the documentation for [StarExec's](https://www.starexec.org/) web interface
+
+### Building
+
+Building requires [**pdflatex**](https://ctan.org/pkg/pdftex) and a fairly full
+TeX installation. If all required packages are installed, a PDF can be generated
+using:
+
+```sh
+make PDF
+```