Created Steps to create sql diff of two database versions (markdown)

Steps-to-create-sql-diff-of-two-database-versions.md

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+- Install GNU diff (On current macOS versions, Apple ships FreeBSD though it used to ship GNU at least as 10.15)
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+`brew install diffutils`
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+then use `/opt/homebrew/bin/diff` as the diff command
+
+- Extract schema from SQLite database:
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+`sqlite3 tests/Test-10.16.0.1.photoslibrary/database/Photos.sqlite ".schema" | sort > sql_11_0_1.sql`
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+- Do same for second database
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+- Then format (prettify) in VSCode (need way to do this on command line)
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+- Create the diff:
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+`diff --new-line-format='+%L' --old-line-format='-%L' --unchanged-line-format=' %L' sql_11_0_1.sql 12_0_1.sql >sql_diff.txt`
+