Updated expressRouteCircuits module with Local tier

[torivara]

Change

Added Local to list of allowed tiers on expressRouteCircuits skuTier parameters. Could not choose Local when testing this module locally ( #357 ). This change adds the possibility for setting Local as a Sku Tier.

Also added some logic on the skuFamily property, because Local setting only allows Unlimited data.

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[ghost]

All CLA requirements met.

[torivara]

I also noticed in the Getting Started guide, there is no option for those only wanting to contribute code changes. There should be an "Option 4: For those that only want to contribute code changes", or something similar.

[AlexanderSehr]

Hey @torivara , thanks for the contribution. Good catch & thanks for not only creating the issue but implementing the solution too. There'd be a 'basic' SKU as well, but I'll create another issue for that one.
Same for the docs, thanks for pointing this out

[AlexanderSehr]

Created issue #359

[AlexanderSehr]

Approved & merged