add recall section

docs/recall/readme.md

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+# recall
+
+These documents are my recall sessions from my learning.
+
+
+## howto
+
+How do I add a new doc to this folder?
+
+1. Recall as much as possible.
+2. Voice to text is fine
+3. Format, spelling, etc. are not important or relevant
+4. Save the changes
+
+If you want to organize the knowledge, **don't** do it in this folder.
+
+Don't add to a recall section later although it doesn't matter if you do. It's just not intended as a crystallized / polished store of knowledge.
+
+## about
+
+Recall, or "free recall" is a powerful tool for learning.
+
+For more about recall, see "A Mind for Numbers" by Barbara Oakley, or her companion free online course titled "Learning How to Learn".