added base examples and drills

kata/example-seam-drill/README.md

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+# example-seam-drill
+
+This kata is a placeholder example showing the intended practice layout.
+
+## Structure
+
+- `original/`: the frozen messy source you copy from for each drill
+- `scenarios/<scenario-name>/code/`: a working copy for one drill attempt
+- `scenarios/<scenario-name>/drill-prompt.md`: the drill instructions
+- `scenarios/<scenario-name>/notes.md`: what you observed, tried, and learned
+
+## Suggested workflow
+
+1. Put the messy starting code in `original/`.
+2. Copy it into a scenario's `code/` directory.
+3. Do the drill only inside that scenario copy.
+4. Record seam choices, tests added, and refactor steps in `notes.md`.
+5. Reset by creating a new scenario from `original/`.