SW_AmpIllumina-B: Add color legend to vis readme

Author: torres-alexis

Amplicon/Illumina/Workflow_Documentation/SW_AmpIllumina-B/workflow_code/visualizations/README.md

@@ -96,4 +96,5 @@ Additionally, the `RColorBrewer_Palette` variable can be modified in the script.
 * **{output_prefix}PCoA_without_labels{assay_suffix}.png** (principle Coordinates Analysis plot of VST transformed ASV counts, without sample labels)
 * **{output_prefix}normalized_counts{assay_suffix}.tsv** (size factor normalized ASV counts table)
 * **{output_prefix}group1_vs_group2.csv** (differential abundance tables for all pairwise contrasts of groups)
-* **{output_prefix}volcano_group1_vs_group2.png** (volcano plots for all pairwise contrasts of groups)
+* **{output_prefix}volcano_group1_vs_group2.png** (volcano plots for all pairwise contrasts of groups)
+* {output_prefix}color_legend_{assay_suffix}.png (color legend for all groups)