add docstrings

internal/data/IDatastore.go

@@ -1,6 +1,7 @@
 package data
 
-// TODO docstring
+// Defines the first layer of abstraction on the interface to a persistent data
+// store. This may be a file or database.
 type IDatastore interface {
     Set(key string, val string) error
     KeyExists(key string)       (bool, error)