Add readme for the physics scripts

Author: AgenttiX

physics/README.md

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+# Physics scripts
+
+This folder contains various scripts for installing physics software and interacting with supercomputers.
+
+Many of these have been developed to solve the exercises
+of the University of Helsinki course PAP331 Computing Methods in High Energy Physics
+([webpage](https://www.mv.helsinki.fi/home/slehti/ComputingMethodsInHEP/ComputingMethodsInHEP.html),
+[course page](https://studies.helsinki.fi/courses/cu/hy-CU-117688380-2021-08-01)).