Executable tutorial: nginx on vagrant box (#956)

* Executable Tutorial: nginx on vagrant box

* Update README.md

* add specification about katacoda

contributions/executable-tutorial/cotutiu-moise/README.md

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+# Executable tutorial: nginx on vagrant box (with provisioning)
+
+## Group
+Ioana Cotutiu (cotutiu@kth.se), [IC-kth](https://github.com/IC-kth)  
+Theodor Moise (moise@kth.se), [iriediese](https://github.com/iriediese)
+
+## Content
+Executable tutorial (via katakoda) showing how to configure and provision an nginx web server on a vagrant box, using a Vagrantfile.  
+This is aimed at showing how to quickly deploy (previously configured) applications in virtual environments running Linux,  
+providing further insight into system management and administration.
+
+## Link
+Katakoda link: TBA
+Repository: TBA