How to enable trickle ICE

### What are you trying to do?

To improve the initial time to exchange ICE Candidates via SDP, I would like to use trickle ICE. As far as I see, the only interface which is available to send the local SdpOffer is the `SetLocalDescription(std::string& sdp)` method followed by a `SendUpdates()`. It is not clear to me whether and how these functions can be utilized for trickle ICE?

### How can the documentation be improved to help your use case?

Add examples on how to use trickle ICE.

### What documentation have you looked at so far?

README.md, searched for `trickle ICE` in the Repo, demo application.