Started configurable options doc

configuration.md

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+# Configurable Minerva options
+This document covers some of the configurable aspects of Minerva.
+
+## Model ID prefix
+The model ID prefix is used when constructing IRIs to name new models and individuals (which are based on their containing model ID). The default is `http://model.geneontology.org/`, however this can be changed via a command-line argument for most CLI commands and the server startup. E.g. `--model-id-prefix 'http://model.myproject.org/'`. 
+
+*TODO: check consistency of argument names across CLI commands.*