docs(Statcast): Add catcher_throwing function documentation

Author: ss77995ss

docs/catcher_throwing.md

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+# Statcast Catcher Throwing
+
+## `catcher_throwing`
+
+Function to get catcher throwing data from each stolen base attempt for a specific catcher. Based on Baseball Savant's [Catcher Throwing](https://baseballsavant.mlb.com/leaderboard/catcher-throwing).
+
+**Examples**
+
+```python
+from baseball_stats_python import catcher_throwing
+
+# Get Will Smith's catcher throwing data
+catcher_throwing('669257')
+
+# Get Will Smith's catcher throwing data in 2023
+catcher_throwing('669257', season='2023')
+
+# Get Will Smith's catcher throwing data in playoffs
+catcher_throwing('669257', game_type=GameType.PLAYOFFS)
+```
+
+**Arguments**
+
+| Argument              | Data Type           | Description                                                                                                                                                   |
+| --------------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| catcher_id (Required) | `str`               | The MLBAM ID of the catcher.                                                                                                                                  |
+| game_type             | `str` or `GameType` | The game type to filter by. Can be `R` for regular season, `PO` for playoffs, or `All` for all games. Check enum [GameType](../enums/statcast_leaderboard.py) |
+| season                | `str`               | The season to filter by. The earliest season available is 2016.                                                                                               |
+
+**Return**
+
+A DataFrame with columns that related to the [Catcher Throwing](https://baseballsavant.mlb.com/leaderboard/catcher-throwing) leaderboard. The DataFrame will represent each stolen base attempt for a specific catcher which contains data like `pop_time`, `throw_type`, `r_primary_lead`, etc.