Add README for RDK

Signed-off-by: Jesse Crews <jesse_crews@comcast.com>
Change-Id: I35f8793db33e1ffefad741280c110236872698ea
diff --git a/README.rdk.md b/README.rdk.md
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--- /dev/null
+++ b/README.rdk.md
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+RDK Build Configuration
+=======
+
+In your RDK build environment, make sure you configure git to use ssh:
+```
+git config --global url.ssh://rdkgerrithub.stb.r53.xcal.tv:29418.insteadOf https://rdkgerrithub.stb.r53.xcal.tv
+git config --global url.ssh://rdkgerrithub.stb.r53.xcal.tv:29418.pushInsteadOf https://rdkgerrithub.stb.r53.xcal.tv
+```
+
+Make sure you load your [SSH public key(s)](https://rdkgerrithub.stb.r53.xcal.tv/settings/#SSHKeys).
+
+You can test your access with:
+```
+ssh-keyscan -t rsa -p 29418 rdkgerrithub.stb.r53.xcal.tv >> ~/.ssh/known_hosts
+ssh -p 29418 rdkgerrithub.stb.r53.xcal.tv
+```
+On successful login, you will see a Gerrit greeting and instructions on how to access
+repositories.
+