Add note about paper in preparation.md

README.md

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-*Here you can find a set of models describing the atmospheric refraction and dispersion.*
+**Note:**
+A manuscript of this atmospheric code is in preparation and will be submitted to the Monthly Notices of the Royal Astronomical Society (MNRAS) journal before the end of the year (2019). 
+If you use this code for your project, please acknowledge this by making a reference to this paper in due course. You can contact me, the author, for the submission and review status.
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+Author info: *Joost van den Born*, *born@astron.nl*
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+*Below you can find a set of models describing the atmospheric refraction and dispersion.*
 
 **Contents:**
 - atmosphericModel.py           : Python model that can be used to calculate the atmospheric refraction and dispersion