Add example images to readme

README.md

@@ -9,14 +9,14 @@ There are two workflows defined. An graphical overview is given below.
 ### download_and_compress_pipeline.cwl
 This workflow is used by the LDV framework.
 
-![Download pipeline Overview](download_and_compress_pipeline.png)
+![Download pipeline Overview](docs/images/download_and_compress_pipeline.png)
 
 The data in this pipeline is first fetched, then the 'compress' step is ran.
 The compress step runs 'compress_pipeline.cwl', which does more than only compression. The steps take are mentioned in the section below.
 
 ### compress_pipeline.cwl
 
-![Compress pipeline Overview](compress_pipeline.png)
+![Compress pipeline Overview](docs/images/compress_pipeline.png)
 
 
 Part of this pipeline identifies known issues and applies corrections if possible. It uses in place updates to prevent copying the measurement set.
@@ -38,12 +38,22 @@ There are also some time ranges that cannot be solved. These issues include:
 - STATION_SENSITIVITY_ISSUE
 - DELAY_COMPENSATION_ISSUE
 
-    
 The measurement set is then compressed the with Dysco if it was not already compressed. After all measure ment sets have been compressed, inspection plots are produced and metrics to quantify the amount of missing/flagged data are collected.
 
 > **_NOTE:_** Some plots may be skipped if the required metadata to make the plot is missing. This is often the case for "unspecified" datasets.
 When a plot is skipped, this is printed to stderr as a warning and thus is shown in the ATDB log file.
 
+# Quality metrics
+The output json conatining a summary of the processing contains a set of quality flags, usually ranging between "poor", "moderate" and "good". The qua;ity is "unknown" if the (meta)data to calculate the metric is missing.
+The quality can also be "N/A" if the quality metric is not relevant for the dataset, for example a quality metric indicating dataloss of critical international stations will be "N/A" if only Dutch stations are present.
+A detailed outline of the quality metrics and their meaning can be found on the following confluence page: https://support.astron.nl/confluence/pages/viewpage.action?spaceKey=LDV&title=Imaging+compression+workflow+metrics+v.2
+
+Four plots are created, examples of these are:
+![Pointing image](docs/images/3C295_800576_pointing.png)
+![Dataloss image](docs/images/3C295_800576_dataloss_antennae.png)
+![Percflagged image](docs/images/3C295_800576_percflagged_antennae.png)
+![Noise image](docs/images/3C295_800576_noise_antennae.png)
+The examples are taken from the following run: https://sdc-dev.astron.nl:5554/atdb/task_details/260179/1
 
 ## Requirements