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]

• ❌ - login: @thakurmi . The commit (59cb9e0) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thakurmi
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[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