VOL-630 - update documentation with default creds and doc ssh key support

Change-Id: I96ec086f55d7861068ee59eb63fef7ff79472100
diff --git a/docker/Dockerfile.cli_custom b/docker/Dockerfile.cli_custom
new file mode 100644
index 0000000..021cc12
--- /dev/null
+++ b/docker/Dockerfile.cli_custom
@@ -0,0 +1,26 @@
+# Copyright 2018 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+ARG TAG=latest
+ARG REGISTRY=
+ARG REPOSITORY=
+
+FROM ${REGISTRY}${REPOSITORY}voltha/voltha-cli:${TAG}
+ARG PUB_KEY_FILE=voltha_rsa.pub
+
+RUN mkdir -p /home/voltha/.ssh
+RUN echo $PUB_KEY_FILE
+COPY ${PUB_KEY_FILE} /home/voltha/.ssh/authorized_keys
+RUN chown -R voltha.voltha /home/voltha/.ssh
+RUN chmod 700 /home/voltha/.ssh
+RUN chmod 600 /home/voltha/.ssh/authorized_keys