[ci skip] Enrich the introduction for debug gem #43621
Merged
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Summary
Hello! I'm a contributor and early adopter of the new ruby/debug gem. I want to add more information about this powerful new tool. And as a start, I added introduction about how to enter the debugging session and introduced a few commands.
If my writing is fine and the format is acceptable, I'll add command introduction and advanced usages in the future 馃槃