docs: Add built in placeholders of FancyCore

docs/src/fancycore/api/api.yml

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+order: 7

docs/src/fancycore/api/placeholders.md

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-# Placeholders API
+# Placeholder API
 
 FancyCore includes a Placeholders API that allows you to create and manage custom placeholders for use in various plugins.
 

docs/src/fancycore/placeholders/placeholders.md

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+---
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+---
+
+# Placeholders
+
+FancyCore provides a set of built-in placeholders that can be used in various parts of the system.
+You can use placeholders in almost any text field within FancyCore.
+FancyCore also offers an API for creating and parse placeholders programmatically, read more about it in the [API documentation](../api/placeholders.md).
+
+## Built-in Placeholders
+
+* [Player related placeholders](player.md)

docs/src/fancycore/placeholders/player.md

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+---
+icon: dot
+title: Player
+---
+
+# Player placeholders
+
+| Name                                     | Identfier                 | Description                                                | Examples outputs                       |
+|------------------------------------------|---------------------------|------------------------------------------------------------|----------------------------------------|
+| Player balance (formatted)               | `player_balance`          | Displays the player's current balance (formatted)          | "0", "123", "123.45", "13,123.97"      |
+| Player balance (raw)                     | `player_balance_raw`      | Displays the player's current balance (raw)                | "0", "123", "123.45", "13123.9417"     |
+| Player chat color (hex)                  | `player_chat_color`       | Displays the player's chat color in hex format             | "#FF0000", "#00FF00", "#0000FF"        |
+| Player first time joined                 | `player_first_joined`     | Displays the date and time the player first joined         | "2023-01-01 12:00:00"                  |
+| Player first time joined (raw timestamp) | `player_first_joined_raw` | Displays the raw timestamp of when the player first joined | "1672531200"                           |
+| Player name                              | `player_name`             | Displays the player's name                                 | "Simon", "OliverHD"                    |
+| Player nickname                          | `player_nickname`         | Displays the player's nickname                             | "Oli"                                  |
+| Player play time (formatted)             | `player_play_time`        | Displays the player's total play time (formatted)          | "0s", "5m 30s", "2h 15m"               |
+| Player play time (ms)                    | `player_play_time_ms`     | Displays the player's total play time in milliseconds      | "0", "330000", "8100000"               |
+| Player UUID                              | `player_uuid`             | Displays the player's UUID                                 | "9b605d04-5a59-4353-bba3-2ddf570eb38a" |