Fixes #2268
Fixes #2268

  - Added clarification to README.md that 'markdown.js' and 'marked.js' scripts were imported within the default included index.html file

rbtcollins/reveal.js,dbs/reveal.js,tehfedaykin/10CommandmentsofCommunityOrganizing,jayramj/agile-retro,10xEngineer/reveal.js,hakimel/reveal.js,jayramj/agile-retro,rbtcollins/reveal.js,rbtcollins/reveal.js,tehfedaykin/10CommandmentsofCommunityOrganizing,10xEngineer/reveal.js,kenkunz/js-crash-course,siddhartha-gadgil/presentations,lvh/reveal.js,rbtcollins/reveal.js,maximesinclair/presentations,seefood/DIYHolidays,hakimel/reveal.js,seefood/DIYHolidays,siddhartha-gadgil/presentations,kenkunz/js-crash-course,dbs/reveal.js,maximesinclair/presentations,rbtcollins/reveal.js,rbtcollins/reveal.js,lvh/reveal.js,siddhartha-gadgil/presentations,Jean85/reveal.js,Jean85/reveal.js