added Zenodo badge

README.md

@@ -6,6 +6,7 @@
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 A generic and fully customisable JSON Bayesian unbinned likelihood fit based on [BAT.jl](https://github.com/bat/BAT.jl) developed for neutrinoless double beta decay searches.
-For more details about the ZeroNuFit.jl tool, read our online [documentation](https://legend-exp.github.io/ZeroNuFit.jl/).
+For more details about the ZeroNuFit.jl tool, read our online [documentation](https://legend-exp.github.io/ZeroNuFit.jl/).