Added README.md with details on the code.

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+### MarStr FileIO for C++
+
+A simple class in the marstr namespace, which has many utility functions which help in dealing with reading from and writing to files. Writing a string for example is wrapped into a convenience call which also writes down the length of the string, prior to the string itself. Likewise, the call to read a string from a file reads the length of the string first, then the string itself is read.
+
+It comes with a number of datatypes that can be read from and written to, and should, in my opinion, cover many bases for file IO.
+
+Have a look at fileio.h to get all details.