Added README

Author: slaypni

README.md

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+SM.js
+=====
+
+SM.js is a tool that helps you memorize tons of things.
+It can be used for foreign words, names of historical persons, biology terms and whatever you want to memorize.
+It employs a method called spaced repetition that shows "flashcards" repeatedly with proper intervals in order to make your memory steady.
+
+It can be used as a stand-alone CLI software.
+It also works as a JavaScript library that can be used as a part of your software.
+
+By the way, "SM" stands for SweetMemento.
+This algorithm is based on a description of SM-15 (SuperMemo 15) with a few modificitations.