Add a web-service how-to for enrichment widgets.

[alexkalderimis]

This should be a section under /web-services/how-tos

[radekstepan]

@julie-sullivan @alexkalderimis Still relevant?

[alexkalderimis]

Indeed. see intermine/intermine#388

[Anisha-28]

Can you give me some clarification on this issue .. so i can work on it @alexkalderimis

[heralden]

Hello @Anisha-28,

This issue would require some familiarity with InterMine. I recommend we save it for the internship period!