Changed README file to explain the installation procedure.

Samo Penic

2015-10-06 4257d8f3ef7169cc92b8a39cbd748e59ecbc4af6

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Original written by Dan Kroll in FORTRAN. Code was then largely adapted and commented by Miha Fosnaric-Fosni. Rewritten into C by Samo Penic-Peni, with help of Miha's extensive explanations.