Add paragraph on goals

index.md

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 Plasma, aka in French "*Plateforme d'eLearning pour l'Analyse de données Scientifiques MAssives*", aims at creating an interactive tool to teach computational analysis of massive scientific data.
 
+Plasma was born out of the need to offer a high-performance analysis environment to our students, based on JupyterHub, but not in the cloud. We wanted a solution that could be easily deployed on bare-metal servers or virtual machines, with numerous and specific analysis environments, simple to create and intuitively manageable.
+
 First instances of Plasma are designed for the needs of teachers and students of the [European Master of Genetics](http://www.magisteregenet.univ-paris-diderot.fr/) at Université de Paris. They provide an authentic experience of the actual genomic and bioinformatic analyses performed in research labs.