Create README.md

Author: johspaeth

README.md

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+# Path Expression
+
+This repository contains an implementation of an algorithm by Tarjan that efficiently computes path expressions based on a labeled graph.
+A path expression is a regular expression describing all path between two nodes in the labeled graph.
+
+The implementation is according to what is described in the paper:
+
+[Fast Algorithms for Solving Path Problems](https://dl.acm.org/citation.cfm?id=322273)