add notes

notes.md

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+we have a top level category called torah media.
+
+right now this is the space to create sets, being the primary set itself.
+
+each set contains one or more elements
+
+each element holds two references. one to the set and one to its parent element.
+
+each element which doesnt have any references to it as a parent is called a leaf.
+
+	each element can have certain media attachments such as:
+	- rich text
+	- a downloadable pdf
+	- a video/audio series