add README

Author: radii

README.md

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+A github mirror (and potential place to collect improvements)
+for the devmem2 utility.
+
+Originally written by, and hosted at, www.lartmaker.nl/lartware/ .
+
+From `devmem2.c` header comment:
+
+```
+devmem2.c: Simple program to read/write from/to any location in memory.
+
+ Copyright (C) 2000, Jan-Derk Bakker (jdb@lartmaker.nl)
+
+This software has been developed for the LART computing board
+(http://www.lart.tudelft.nl/). The development has been sponsored by
+the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/)
+and Ubiquitous Communications (http://www.ubicom.tudelft.nl/)
+projects.
+```