Update README.md

Author: hmetcalfe1

README.md

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-# BGmodel
+# BGmodel
+
+This is the underlying code for a shiny app exploring some principles of ecological modelling.
+The app is hosted at https://hmetcalfe1.shinyapps.io/BGmodel/
+
+The app uses a real-world exapmple of a problematic agricultural weed and how we might model its growth year-on-year. 
+The data used in the examples are simulated data and are not derived from experiments.
+
+The app is aimed at 16-18 year olds interested in pursuing a career in applied mathematics and can be used as a stand alone tool or as a teaching aid in a classromm setting.