added readme

readme.txt

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+The default windows API functions to load external libraries into a program
+(LoadLibrary, LoadLibraryEx) only work with files on the filesystem.  It's
+therefore impossible to load a DLL from memory.
+
+But sometimes, you need exactly this functionality (e.g. you don't want to
+distribute a lot of files or want to make disassembling harder).  Common
+workarounds for this problems are to write the DLL into a temporary file
+first and import it from there.  When the program terminates, the temporary
+file gets deleted.
+
+MemoryModule is a library that can be used to load a DLL completely from
+memory - without storing on the disk first.
+
+See doc/readme.txt for more informations about the format of a DLL file and
+a tutorial how they can be loaded directly.