Updated docs

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docs/objects/Textfield/addRule.md

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+## addRule
+Adds a new rule for special coloring
+
+#### Parameteres:
+1. `string` a pattern - check out this page: (https://riptutorial.com/lua/example/20315/lua-pattern-matching)
+2. `number|color` text color
+3. `number|color` background color - optional
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Changes the color of all numbers
+```lua
+local mainFrame = basalt.createFrame()
+local aTextfield = mainFrame:addTextfield():addRule("%d", colors.lightBlue)
+```
+```xml
+<textfield>
+    <rules>
+        <rule>
+            <pattern>%d</pattern>
+            <fg>lightBlue</fg>
+        </rule>
+    </rules>
+</textfield>
+```