Fix #37 - Add best practice to include shapes.txt

[e-lo]

Summary:

Fixes #37 to add a best practice to include shapes.txt

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[scmcca]

My thoughts at #37 (comment)

[Sergiodero]

As GTFS Best Practices (BP) are currently in the process of being merged to the specification, MobilityData is migrating outstanding issues and PRs from this repository to google/transit. Thus, this PR will be closed and further discussion regarding this BP should take place in google/transit. Please refer to Issue #421 for a more detailed explanation of the migration process and the proposed next steps.

With this, we’re hoping to bring more visibility to outstanding BP issues and to restart the discussion around them, so that any improvement that the community finds valuable could be carried forward.