dev-notes: barebones list of file format needs for current capabiliti…

…es of VFGEN.

dev-notes/file-format.md

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+VFGEN needs an alternative to the XML file format.
+
+For the current capabilities of VFGEN, the essential information is
+
+vector_field
+    name                    (id)
+    independent_variable    (id)
+    description             (text)
+
+constant
+    name                    (id)
+    value                   (formula)
+    description             (text)
+    latex                   (text)
+
+parameter
+    name                    (id)
+    description             (text)
+    default_value           (formula)
+    latex                   (text)
+
+expression
+    name                    (id)
+    formula                 (formula)
+    description             (text)
+    latex                   (text)
+
+state_variable
+    name                    (id)
+    derivative              (formula)
+    description             (text)
+    period_from             (formula)
+    period_to               (formula)
+    default_ic              (formula)
+    default_history         (formula)
+    latex                   (text)
+
+function
+    name                    (id)
+    formula                 (formula)
+    description             (text)