add an Rmarkdown post for demo purposes

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

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+---
+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.markdown

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+---
+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.