created Migrate.md

[journeyman]

addresses requests from: #1099 and #1144

[codecov-io]

Current coverage is 77.28%

Merging #1550 into master will not affect coverage as of 08f001a

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Review entire Coverage Diff as of 08f001a

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[sharwell]

💭 I'm a bit torn on this. It looks like a lot of work for relatively little gain. It's quite easy in my experience to use the rule set editor to configure the severity of rules. I have the following additional specific concerns:

1. This only covers the severity of rules. Users will still have to configure stylecop.json separately and/or reconsider the severity of rules in cases where the behavior of this project does not precisely match StyleCop "classic".
2. This script could enable rules which are currently disabled because they are either not implemented or are completely untested. It seems like it could manually configure the severity of rules which are permanently disabled, such as SA1603 (DocumentationMustContainValidXml) (see Permanently disable SA1603 (DocumentationMustContainValidXml) #1324). When rules are permanently disabled, a diagnostic descriptor for them is retained in order for the status site to extract information from them (it doesn't use it currently), but the diagnostic is hidden from the rule set editor interface.

[pdelvo]

Do we want to move this PR forward?

[dmitryvhf]

Script checked. Easy in using.