Added entry for hack "Astro-MNIST"

astrohackweek20/astro-mnist.yml

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+title: Astro-MNIST
+creators: 
+    -Aleksandra Ciprijanovic
+description: > 
+   Currently there are no official benchmarking datasets in astronomy (Astro-MNIST) 
+   that can be used by the community to compare different ML models and techniques in order to 
+   understand the improvements and benefits of novel approaches. Goal of the project - gather resources in one spot: 
+   links to available simulators (for dataset generation) and simulated / observed datasets, links to hosted datasets we 
+   prepared for various astronomy research fields (galaxy images, variable stars, supernova spectra etc.), example Jupyter 
+   files for using datasets to facilitate easier use and learning, include a set of guidelines for astro-ML “best practices”, 
+   links to books and learning resources."
+source-url: https://github.com/AleksCipri/AstroBenchmarking
+live-url: https://alekscipri.github.io/AstroBenchmarking/
+contact-email: [email protected]
+images: astro-mnist.png
+orcid: orcid.org/0000-0003-1281-7192