Add readme

readme.md

+# M4M Trim
+
+Unlike IVMCTrim, there is no trim implementation here; it's just a trimmed copy of the experiment files and the soures for M4M.
+
+Directories:
+ - `ExperimentGeneration`: experiment generation files, see the inner readme
+ - `M4M_MkI`: M4M itself (model, command line, plotter, etc.), see the inner readme for information
+ - `M4MDenseDev`: a (windows only) tool used for demos
+ - `M4MDenseMod`: a (windows only) tool for interrogating the MC problem mostly
+ - `M4MPlotting`: a (windows only) tool for previewing plots
+ - `NetState`: a serialisation library
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