Added Variables to commands in Read Me

[thakurmi]

Is this a bug fix or adding new feature? No.

What is this PR about? / Why do we need it? This PR adds programmable variables to efs-create-filesystem.md to improve the setup experience.

What testing is done? Tested these changes for my setup.

[linux-foundation-easycla[bot]]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thakurmi Once this PR has been reviewed and has the lgtm label, please assign ashley-wenyizha for approval. For more information see the Kubernetes Code Review Process.

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Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/kubernetes-sigs/aws-efs-csi-driver/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @thakurmi. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mskanth972]

@thakurmi can you get EasyCLA authorization, otherwise PR looks good to me.

[mskanth972]

/ok-to-test /lgtm