update readme

README.md

@@ -58,7 +58,7 @@ We have developed [Docker images](https://hub.docker.com/repository/docker/ruana
 ## HTRfit simulation workflow
 
 <div id="bg"  align="center">
-  <img src="vignettes\figs\htrfit_workflow.png" width="500" height="300">
+  <img src="./vignettes\figs\htrfit_workflow.png" width="500" height="300">
 </div> 
 
 
@@ -73,6 +73,7 @@ Furthermore, the coefficients $\beta_i$ represent the natural logarithm fold cha
 ## Getting started
 
 ```
+library('HTRfit')
 ## -- init a design 
 input_var_list <- init_variable( name = "varA", mu = 0, sd = 0.29, level = 60) %>%
                   init_variable( name = "varB", mu = 0.27, sd = 0.6, level = 2) %>%