Added subtree merged in doc/wiki

doc/wiki/Task-json.md

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+## Goal ##
+- Make this JSON library the default one for the community
+
+## Steps ##
+- restructure to follow the (doc,library,test,...) structure
+- extract gobo from it, and provide json.ecf, json-safe.ecf, json_with_gobo.ecf (and json_with_gobo-safe.ecf : not possible right now, but we can _cheat_)
+- and then let Eiffel Software include it, in the official libraries
+
+## Roadmap ##
+- this should be done before 1st of October