Update model.md

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phetsims · Jan 9, 2019 · 987c324 · 987c324
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-TODO model description
+# Masses and Springs: Basics - model description
+This simulation is a subset of the Masses and Springs simulation. The model is derived from MAS and is consistent with that sim. Energy values are not included in MASB.
+
+For details on the model for Masses and Springs, see https://github.com/phetsims/masses-and-springs/blob/master/doc/model.md.