Add paper link to README.md

Author: ssjShirley

README.md

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 A Multipath Extension to the QUIC Module in ns-3
 ================================
 
+The implementation is described in [this paper](https://dl.acm.org/doi/10.1145/3592149.3592803).
+
+Please use the issue tracker for bugs/questions.
 
 ## MPQUIC code base
 This repository contains in the `src/quic` for a multipath extension to the QUIC protocol for ns-3.
 
 [src/quic/Readme](https://github.com/ssjShirley/mpquic-ns3/blob/mpquic-1.2/src/quic/README.md) details the code structure and the implementation align the [IETF draft](https://datatracker.ietf.org/doc/draft-ietf-quic-multipath/04/).
 
 
-<!-- The implementation is described in [this paper](https://arxiv.org/abs/1902.06121). -->
-
-<!-- Please use the issue tracker for bugs/questions. -->
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 ## Install
 
 ### Prerequisites ###