Add more instruction accessing internal Docker registry

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Hi there,
Could you please add more instruction on how to access docker registry? First of all the link you gave in the README is broken. In addition to fixing it, it would be helpful if you could list the steps and access points in the README directly instead of referring to the more generic os docs which takes much longer to sort out.

btw, thanks for all the efforts. It makes learning os much easier despite I have access to an os enterprise instance.

[abbr]

In fact, I have gone as far as following this post to add hub.10.2.2.2.xip.io:5000 to InsecureRegistry and ran following command with error shown. I am using Windows 10 with later version of docker toolbox. I appreciate if you could provide a verified working instruction.

$ docker login -u admin -p $(oc whoami -t) -e a@b.com hub.10.2.2.2.xip.io:5000
An error occurred trying to connect: Post http://127.0.0.1:2375/v1.22/auth: dial tcp 127.0.0.1:2375: connectex: No connection could be made because the target machine actively refused it.