Add BD2K as a participating organization

Author: mr-c

README.md

@@ -137,6 +137,7 @@ Conduct](https://github.com/common-workflow-language/common-workflow-language/bl
 * [Institute for Systems Biology](https://www.systemsbiology.org/)
 * [ELIXIR Europe](https://www.elixir-europe.org/)
 * [BioExcel CoE](http://bioexcel.eu/)
+* [BD2K](https://commonfund.nih.gov/bd2k)
 
 ## Individual Contributors