SW_AmpIllumina-B: Added --visualizations to readme

Author: torres-alexis

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

@@ -167,6 +167,8 @@ ___
 * `--specify-runsheet` - specifies the runsheet to use when multiple runsheets are generated
    > *Optional parameter used in Approach 1 for datasets that have multiple assays for the same amplicon target (e.g. [OSD-249](https://osdr.nasa.gov/bio/repo/data/studies/OSD-249)).*
 
+* `--visualizations TRUE/FALSE` - if set to TRUE, the [visualizations script](workflow_code/visualizations/Illumina-R-visualizations.R) will be run. Default: FALSE
+
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 **Parameter Definitions for `snakemake`**