add badge to readme

Author: yen-hsiang-chang

README.md

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 # ParAMD: Parallel Approximate Minimum Degree Algorithm
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 [[Installation]](#installation) [[Using ParAMD]](#using-paramd) [[Replicating Our benchmarks]](#replicating-our-benchmarks) [[Citation and Acknowledgments]](#citation-and-acknowledgments) [[Copyright]](#copyright)
 
 ParAMD is a shared memory parallel implementation of the approximate minimum degree (AMD) algorithm with multiple elimination via distance-2 independent sets.