Add list of modified 3rd party dependencies (#236)

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+# Library dependencies for openwhisk-apigateway
+
+Like other open source projects, openwhisk-apigateway is dependent on open source libraries.
+We list them here to assure that all code dependencies have Apache 2.0 compatible licenses.
+
+| Library name | Licenses Type | License/Project Link | Notes |
+| ------| ------ | ------ | ------ |
+| fakengx | MIT | https://github.com/bsm/fakengx | Modified to support some Cloud Foundry specific use cases
+| fakeredis | MIT | https://github.com/catwell/fakeredis | Modified to support using the OpenResty redis library