add beamer demo & sharelatex

README.md

@@ -10,10 +10,13 @@
 * [來排一份考卷吧](https://github.com/andylee830914/Learning_LaTeX/blob/master/latex_04_exam.pdf)
    * [Demo](https://github.com/andylee830914/Learning_LaTeX/blob/master/Demo/exam%20demo/exam.pdf)
 * 大型文件排版
+* 來做投影片吧！Beamer
+    * [Demo](https://github.com/andylee830914/Learning_LaTeX/blob/master/Demo/beamer%20demo/slides_example.pdf)
 
 ## 參考資料
 * [LaTeX – A document preparation system](https://latex-project.org)
 * [新手安裝LaTeX懶人教學(Step by step)]( http://leavedcorn.pixnet.net/blog/post/24773932-新手安裝latex懶人教學(step-by-step))
 * [HostMath - Online LaTeX formula editor](http://www.hostmath.com)
 * [清大資工Latex教學](http://www.cs.nthu.edu.tw/~cherung/teaching/2009cs5321/link/latex.pdf)
 * [LaTeX Mathematical Symbols](http://www.auburn.edu/~tamtiny/Symbols.pdf)
+* [ShareLaTeX, Online LaTeX Editor](https://www.sharelatex.com)