preprocessor submodule: README.md

README.md

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+
+# Dynare Preprocessor
+
+The Dynare Preprocessor defines the Dynare model language. It takes in a `.mod`
+file, computes the derivatives of the model represented therein, and produces
+Matlab/Octave, C, Julia, or JSON output.
+
+There is more to come here. For the moment, see the [Dynare
+repository](https://github.com/DynareTeam/dynare)
+
+# License
+
+Most of the source files are covered by the GNU General Public Licence version
+3 or later. There are some exceptions. See [license.txt](license.txt) for specifics.