6 add example spectrum plot to readmemd

README.md

@@ -1,4 +1,4 @@
-![test workflow](https://github.com/csiro-internal/soilspec.format/actions/workflows/test.yml/badge.svg)
+![test workflow](https://github.com/csiro/soilspec.format/actions/workflows/test.yml/badge.svg)
 
 # Overview
 soilspec.format is a package for extracting data frames and
@@ -69,6 +69,8 @@ The extracted data frames will always have the columns: "wavenumber" and "intens
 
 > plot(result$data, type="l")
 
+![ASD plot](https://github.com/csiro/soilspec.format/assets/asd_example_plot.png)
+
 > result$standardised.metadata
 $sample_id
 [1] ""