Added template slides

Author: DavidGinzberg

md/lecture-template.md

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+#Lecture Template
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+#First Slide
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+[4em](https://www.w3schools.com/CSSref/css_units.asp) [checksum](https://en.wikipedia.org/wiki/Checksum) [Clojure](https://clojure.org/) [gwt](http://www.gwtproject.org/) [emmet](http://emmet.io/)
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+# New sub-slide using `-\n`
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+Some content
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+# New slide using `-\n-\n`
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+More content