Add sdks workspace, update README

[rygine]

Summary

• Added sdks workspace, move SDKs into it
• Update README
• Removed deprecated launch.json
• Removed unused setting in settings.json

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Latest commit: f9a51f3

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[alexrisch]

Is packages/* needed anymore?

[rygine]

good callout, yep! i'm going to migrate some packages from other repos into this one and use the packages workspace for them.