Apply FINOS Software Project Blueprint

[ystxn]

Steps required by https://odp.finos.org/docs/project-collaboration/#finos-project-blueprint:

Previously missing these 4 components:

• [x] A Code of Conduct template, required by FINOS bylaws
• [x] Contributing guidelines, required by FINOS bylaws
• [x] WhiteSource custom configuration, to setup continuous security scanning for your project
• [x] Issue templates for bugs, feature requests and support questions , defined in the .github folder