add reactRouterExample() in README

Author: lgnbhl

README.Rmd

@@ -50,7 +50,7 @@ install.packages("reactRouter")
 
 Get started with a showcase example:
 
-```{r}
+```r
 # print all examples available: reactRouterExample()
 reactRouterExample("basic")
 ```

README.md

@@ -42,7 +42,14 @@ HashRouter(
 install.packages("reactRouter")
 ```
 
-### More tutorials
+### Example
+
+Get started with a showcase example:
+
+``` r
+# print all examples available: reactRouterExample()
+reactRouterExample("basic")
+```
 
 Read the vignette
 [here](https://felixluginbuhl.com/reactRouter/articles/introduction.html)