Update Readme

Signed-off-by: JP-Ellis <josh@jpellis.me>

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+MadGraph
+=======
+
+[![AUR badge][AUR badge]][AUR]
+
+MadGraph installer Arch Linux.
+
+[MadGraph5_aMC@NLO][homepage] is a framework that aims at providing all the
+elements necessary for SM and BSM phenomenology, such as the computations of
+cross sections, the generation of hard events and their matching with event
+generators, and the use of a variety of tools relevant to event manipulation and
+analysis. Processes can be simulated to LO accuracy for any user-defined
+Lagrangian, and the NLO accuracy in the case of QCD corrections to SM
+processes. Matrix elements at the tree- and one-loop-level can also be obtained.
+
+MadGraph5_aMC@NLO is the new version of both MadGraph5 and aMC@NLO that unifies
+the LO and NLO lines of development of automated tools within the MadGraph
+family. It therefore supersedes all the MadGraph5 1.5.x versions and all the
+beta versions of aMC@NLO.
+
+The standard reference for the use of the code is:
+
+> J. Alwall et al, "The automated computation of tree-level and next-to-leading
+> order differential cross sections, and their matching to parton shower
+> simulations", [doi:10.1007/JHEP07(2014)079][doi]
+
+A more complete list of references can be
+found [here](http://amcatnlo.web.cern.ch/amcatnlo/list_refs.htm).
+
+[homepage]: https://launchpad.net/mg5amcnlo
+[doi]: https://doi.org/10.1007/JHEP07(2014)079
+[AUR]: https://aur.archlinux.org/packages/madgraph/
+[AUR badge]: https://img.shields.io/aur/version/madgraph.svg
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-#+TITLE: madgraph [[https://aur.archlinux.org/packages/madgraph/][https://img.shields.io/aur/version/madgraph.svg]]
-
-MadGraph bundled for installation on Arch Linux.