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Supplementary layouts added:

1. Cloned the repo
2. Went inside browsercore/src/cyjshiny.js
3. Added the npm dependency e.g. 
let spread = require('cytoscape-spread');
cytoscape.use(spread);
4. Also added the name of the new layout inside the doLayout function in cyjshiny.R file present at R/cyjshiny.R path
5. Executed the make file to build the bundle.js