Placeholders.md

+These are all of the placeholders MythicRPG provides
+
+[[_TOC_]]
+
+## Caster Placeholders
+| Placeholder                        | Function                                                          |
+|:----------------------------------:|-------------------------------------------------------------------|
+| <caster.archetype>                 | Returns the caster's [archetype](/Archetypes)                     |
+
+
+## Placeholder API Integration
+| Placeholder                        | Function                                                          |
+|:----------------------------------:|-------------------------------------------------------------------|
+| %mythic_reagent_[name]%            | The reagent's current value.<br>Defaults to `0`.<br>If the resource does not exist, returns `[Invalid_Resource]`                                                             |
+| %mythic_reagent_max_[name]%        | The reagent's max value.<br>Defaults to `0`.<br>If the resource does not exist, returns `[Invalid_Resource]`                                                             |
+| %mythic_class_[group]%             | The player's selected archetype of the specified group.<br>Defaults to `NONE`                                                                                                |
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