add two Rmd files for demo purposes

Author: yihui

exampleSite/content/_index.Rmd

@@ -0,0 +1,24 @@
+---
+title: Home
+---
+
+[<img src="https://simpleicons.org/icons/github.svg" style="max-width:15%;min-width:40px;float:right;" alt="Github repo" />](https://github.com/yihui/hugo-xmin)
+
+# HUGO XMIN
+
+## _Keep it simple, but not simpler_
+
+**XMin** is a Hugo theme written by [Yihui Xie](https://yihui.name) in about four hours: half an hour was spent on the Hugo templates, and 3.5 hours were spent on styling. The main motivation for writing this theme was to provide a really minimal example to beginners of Hugo templates. This XMin theme contains about 130 lines of code in total, including the code in HTML templates and CSS (also counting empty lines).
+
+```{bash, comment='', echo=2}
+cd ../..;
+find . -not -path '*/exampleSite/*' \( -name '*.html' -o -name '*.css' \) | xargs wc -l
+```
+
+I can certainly further reduce the code, for example, by eliminating the CSS, but I believe a tiny bit CSS can greatly improve readability. You cannot really find many CSS frameworks that only contain 50 lines of code.
+
+Although it is a minimal theme, it is actually fully functional. It supports pages (including the home page), blog posts, a navigation menu, categories, tags, and RSS. With [a little bit customization](https://github.com/yihui/hugo-xmin/blob/master/exampleSite/layouts/partials/foot_custom.html), it can easily support LaTeX math expressions, e.g.,
+
+`$${\sqrt {n}}\left(\left({\frac {1}{n}}\sum _{i=1}^{n}X_{i}\right)-\mu \right)\ {\xrightarrow {d}}\ N\left(0,\sigma ^{2}\right)$$`
+
+All pages not under the root directory of the website are listed below. You can also visit the list page of a single section, e.g., [posts](/post/), or [notes](/note/). See the [About](/about/) page for the usage of this theme.

exampleSite/content/_index.md

@@ -21,12 +21,12 @@ find . -not -path '*/exampleSite/*' \( -name '*.html' -o -name '*.css' \) | xarg
       12 ./layouts/_default/single.html
       16 ./layouts/_default/terms.html
        0 ./layouts/partials/foot_custom.html
-       9 ./layouts/partials/footer.html
+      20 ./layouts/partials/footer.html
        0 ./layouts/partials/head_custom.html
       19 ./layouts/partials/header.html
        7 ./static/css/fonts.css
       50 ./static/css/style.css
-     136 total
+     147 total
 ```
 
 I can certainly further reduce the code, for example, by eliminating the CSS, but I believe a tiny bit CSS can greatly improve readability. You cannot really find many CSS frameworks that only contain 50 lines of code.

exampleSite/content/post/2017-06-21-an-r-markdown-example.Rmd

@@ -0,0 +1,19 @@
+---
+title: An R Markdown Example
+author: Yihui Xie
+date: '2017-06-21'
+categories:
+  - Example
+  - R
+tags:
+  - blogdown
+slug: an-r-markdown-example
+---
+
+This is a simple R Markdown example, with a single R code chunk below.
+
+```{r}
+knitr::kable(head(mtcars))
+```
+
+The table shows the first 6 rows of the `mtcars` dataset in base R.

exampleSite/content/post/2017-06-21-an-r-markdown-example.md

@@ -0,0 +1,31 @@
+---
+title: An R Markdown Example
+author: Yihui Xie
+date: '2017-06-21'
+categories:
+  - Example
+  - R
+tags:
+  - blogdown
+slug: an-r-markdown-example
+---
+
+This is a simple R Markdown example, with a single R code chunk below.
+
+
+```r
+knitr::kable(head(mtcars))
+```
+
+
+
+|                  |  mpg| cyl| disp|  hp| drat|    wt|  qsec| vs| am| gear| carb|
+|:-----------------|----:|---:|----:|---:|----:|-----:|-----:|--:|--:|----:|----:|
+|Mazda RX4         | 21.0|   6|  160| 110| 3.90| 2.620| 16.46|  0|  1|    4|    4|
+|Mazda RX4 Wag     | 21.0|   6|  160| 110| 3.90| 2.875| 17.02|  0|  1|    4|    4|
+|Datsun 710        | 22.8|   4|  108|  93| 3.85| 2.320| 18.61|  1|  1|    4|    1|
+|Hornet 4 Drive    | 21.4|   6|  258| 110| 3.08| 3.215| 19.44|  1|  0|    3|    1|
+|Hornet Sportabout | 18.7|   8|  360| 175| 3.15| 3.440| 17.02|  0|  0|    3|    2|
+|Valiant           | 18.1|   6|  225| 105| 2.76| 3.460| 20.22|  1|  0|    3|    1|
+
+The table shows the first 6 rows of the `mtcars` dataset in base R.