Add Readme

README.Rmd

+# xaringanthemer
+
+[xaringan]: https://github.com/yihui/xaringan
+
+Easily style your [xaringan] slides with **xaringanthemer**
+
+## Installation
+
+Currently, this is a work in progress.
+Try it yourself:
+
+```r
+devtools::install_github("gadenbuie/xaringanthemer")
+```
+
+## Make it work
+
+To make it work, add `css: xaringan-themed.css` to your xaringan slides YAML header under `xaringan::moonreader:`
+
+```yaml
+output:
+  xaringan::moon_reader:
+    lib_dir: libs
+    css: xaringan-themed.css
+```
+
+Then, in the first knitr chunk, try this:
+
+````markdown
+```{r setup} `r ''`
+options(htmltools.dir.version = FALSE)
+library(xaringanthemer)
+mono_dark(
+  base_color = "#b6174b",
+  header_font_google = google_font("Josefin Sans"),
+  text_font_google = google_font("Montserrat", "300", "300i"),
+  code_font_google = google_font("Droid Mono")
+)
+```
+````
+