Add NFL Draft example data for blog post (#117)

Author: margaretkennedy

NFLDraft/README.md

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+# NFL Draft Data
+
+Sample data for the [NFL Draft Analytics](https://deephaven.io/blog/2026-04-20-nfl-draft-analytics/) blog post. Covers 2000–2023 NFL Draft picks with career outcomes and combine measurables.
+
+## Files
+
+| File | Rows | Source |
+|------|------|--------|
+| `csv/nfl_draft_picks.csv` | ~12,670 | [nflverse](https://github.com/nflverse/nflverse-data) |
+| `csv/nfl_combine.csv` | ~7,999 | [nflverse](https://github.com/nflverse/nflverse-data) |
+
+## Schema
+
+**`nfl_draft_picks.csv`**
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `year` | int | Draft year |
+| `round` | int | Round (1–7) |
+| `pick` | int | Overall pick number |
+| `team` | string | Drafting team abbreviation |
+| `player` | string | Player name |
+| `position` | string | Position |
+| `college` | string | College |
+| `games_played` | int | Career games played |
+| `pro_bowls` | int | Pro Bowl selections |
+| `all_pro` | int | All-Pro selections |
+| `approximate_value` | float | Career approximate value (PFR metric) |
+
+**`nfl_combine.csv`**
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `player` | string | Player name |
+| `year` | int | Combine year |
+| `forty_yard` | float | 40-yard dash (seconds) |
+| `bench_press` | int | Bench press reps (225 lbs) |
+| `vertical` | float | Vertical jump (inches) |
+| `broad_jump` | int | Broad jump (inches) |
+| `cone_drill` | float | 3-cone drill (seconds) |
+| `shuttle` | float | 20-yard shuttle (seconds) |
+
+## Usage
+
+```python
+from deephaven import read_csv
+
+draft = read_csv("https://media.githubusercontent.com/media/deephaven/examples/main/NFLDraft/csv/nfl_draft_picks.csv")
+combine = read_csv("https://media.githubusercontent.com/media/deephaven/examples/main/NFLDraft/csv/nfl_combine.csv")
+```
+
+# Source and Licence
+
+Data sourced from [nflverse](https://github.com/nflverse/nflverse-data), which aggregates NFL data under open licenses.
+
+Deephaven makes no claim of its authenticity or its accuracy. It has been placed here for demonstrative purposes.

NFLDraft/csv/nfl_combine.csv

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NFLDraft/csv/nfl_draft_picks.csv

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