Update README.md assignment 1

Author: stef4k

assignment-1/README.md

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-# Assignment 1
+# Degeneracy - Graph Theory
+
+This assignment was asking to detect the [k-cores](https://en.wikipedia.org/wiki/Degeneracy_(graph_theory)) of a graph. Implement the following algorithm to find the core number of each node of any given graph:
+
 The greek version of the assignment description is found [here](https://github.com/dmst-algorithms-course/assignment-2019-1/blob/master/assignment_2019_1.ipynb)
+