adding basic data storage

internal/data/IDatastore.go

@@ -0,0 +1,9 @@
+package data
+
+type IDatastore interface {
+    Set(key string, val string) error
+    KeyExists(key string)       (bool, error)
+    Get(key string)             (string, error)
+    GetAll()                    (map[string]string, error)
+    GetAllKeys()                (map[string]bool, error)
+}