add google group subscribtion method using only emails

* users don't have to create an google account for using the google groups. They can simply email to e.g. "[email protected]" to subscribe. * since this behavior is not mentioned on the google group website, i think its a good idea to explain this method here. Signed-off-by: toogley <[email protected]>
zhyhzhylove · Feb 28, 2016 · e3e1858 · e3e1858
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -154,6 +154,8 @@ However, there might be a way to implement that feature *on top of* Docker.
       The <a href="https://groups.google.com/forum/#!forum/docker-dev" target="_blank">docker-dev</a>
       group is for contributors and other people contributing to the Docker
       project.
+      You can join them without an google account by sending an email to e.g. "[email protected]".
+      After receiving the join-request message, you can simply reply to that to confirm the subscribtion.
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diff --git a/README.md b/README.md
@@ -234,6 +234,8 @@ We are always open to suggestions on process improvements, and are always lookin
       The <a href="https://groups.google.com/forum/#!forum/docker-dev" target="_blank">docker-dev</a>
       group is for contributors and other people contributing to the Docker
       project.
+      You can join them without an google account by sending an email to e.g. "[email protected]".
+      After receiving the join-request message, you can simply reply to that to confirm the subscribtion.
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