ModSim ass4 taddeus: Wrote README.

modsim/ass4_taddeus/README

+The folders in the main directory belong to both parts of the assignment
+('ring' and 'vibstring' relate to parts '1: Ring communication' and '2:
+Vibrating string' respectively). The 'vibstring' folder contains bots the
+sequential and parallel implementation ('seq.c' and 'par.c').
 
+The usage of the code is extensively discussed in both reports
+('report_ring.pdf' and 'report_vibstring.pdf'), and will not be discussed here
+further for that reason.