README: Document YouTube and IRC backchannel for meetings

On Mon, Aug 10, 2015 at 09:38:50AM -0700, Mrunal Patel wrote [1]:
> There is a limit of 10 participants per hangout. So, I will
> broadcast it at the time when it starts and people who aren't
> invited could view the stream and discuss on IRC.

On Mon, Aug 10, 2015 at 09:53:59AM -0700, Mrunal Patel wrote [2]:
> I think the youtube channel should work as the broadcast link
> https://www.youtube.com/channel/UC1wmLdEYmwWcsFg7bt1s5nw

The IRC channel location is from opencontainers/web@f693390f (updated
content, 2015-06-21).

[1]: https://groups.google.com/a/opencontainers.org/d/msg/dev/Cy5uFI_ySpg/E1FnYUmfDwAJ
     From: Mrunal Patel
     Subject: Re: Discussions and Notes
     Date: Mon, 10 Aug 2015 09:38:50 -0700
     Message-ID: <CANEZBD7K=8+i7RaTAkg_0XLUSQrZLykGR0bxce-JtErO8KAQ1Q@mail.gmail.com>
     Cc: dev <[email protected]>, ...
[2]: https://groups.google.com/a/opencontainers.org/d/msg/dev/Cy5uFI_ySpg/X4RQEx2gDwAJ
     From: Mrunal Patel
     Subject: Re: Discussions and Notes
     Date: Mon, 10 Aug 2015 09:53:59 -0700
     Message-ID: <CANEZBD7snSro5GXYc6QRuk3+KnR0WAeFThfQXvOcnx3t9jNXag@mail.gmail.com>
     Cc: dev <[email protected]>, ...

Signed-off-by: W. Trevor King <[email protected]>

Author: wking

README.md

@@ -64,11 +64,16 @@ the `LICENSE` file of this repository.
 ## Weekly Call
 
 The contributors and maintainers of the project have a weekly meeting Wednesdays at 10:00 AM PST.
-Everyone is welcome to participate in the call.
 The link to the call will be posted on the mailing list each week along with set topics for discussion.
-Everyone is welcome to propose additional topics or suggest other agenda alterations via the mailing list.
+Everyone is welcome to participate in the call, although there can only be speaking members on the Google Hangout.
+Participants who don't get a speaking slot can watch the live broadcast on [this YouTube channel][youtube] and post feedback and questions on [the IRC channel](#irc).
+Everyone is welcome to propose additional topics, suggest other agenda alterations, or request a speaking slot via the mailing list.
 Minutes for the call will be posted to the mailing list for those who are unable to join the call.
 
+## IRC
+
+OCI discussion happens on #opencontainers on Freenode.
+
 ## Markdown style
 
 To keep consistency throughout the Markdown files in the Open Container spec all files should be formatted one sentence per line.
@@ -129,3 +134,5 @@ then you just add a line to every git commit message:
 using your real name (sorry, no pseudonyms or anonymous contributions.)
 
 You can add the sign off when creating the git commit via `git commit -s`.
+
+[youtube]: https://www.youtube.com/channel/UC1wmLdEYmwWcsFg7bt1s5nw