added wiki page "Using CUB for Modifiers"

wiki/users/cub-modifiers.md

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+# Using CUB for Modifiers
+
+> ⚠ The module [Combat Utility Belt](https://foundryvtt.com/packages/combat-utility-belt) is required.
+
+
+## Attributes modifiers
+Replace `<attribute>` with actual attribute (i.e. `endurance`, `vigilance`, `focus`, `composure`) and `<number>` with actual number to be added.
+
+When setup in CUB this would modify PC derived attributes to increase or reduce them by the number given.
+
+Allows automating certain invocations and item effects (such as the cursed Kama from Sins of Regret supplement).
+
+
+### For `character` type
+Syntaxe:
+> system.modifiers.character.`<attribute>` += `<number>`
+
+Examples:
+> system.modifiers.character.endurance += 1  // add 1
+> <br>system.modifiers.character.focus += -2 // remove 2
+
+
+### For `adversary` or `minion` types
+Syntaxe:
+> system.`<attribute>` += `<number>`
+
+Exemples:
+> system.vigilance += 1      // add 1
+> <br>system.composure += -2 // remove 2
+
+
+
+## Rings/Skills modifiers
+Both PCs and NPCs can have their skills and rings increased as well by conditions (should you wish to ignore some of the RAW).
+
+Syntaxe:
+> system.rings.`<ring>` += `<number>`
+> <br>system.skills.`<skillGroup>`.`<skill>` += `<number>` // for PCs
+> <br>system.skills.`<skillGroup>`           += `<number>` // for NPCs
+
+Exemples:
+> system.rings.earth += 1
+> <br>system.skills.artisan.aesthetics += 1  // for PCs
+> <br>system.skills.martial            += -1 // for NPCs
+
+
+The above need to be setup as conditions using CUB at the moment so that they can be added/removed as required.
+
+Regarding skills and rings modifiers, I believe you would need to remove them temporarily for advancements as it might cause extra XP to be spent, but yet to test it fully.