add UIKitColumn

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitColumn.kt

@@ -0,0 +1,15 @@
+package dev.inmo.jsuikit.modifiers
+
+sealed class UIKitColumn(classname: String) : UIKitModifier {
+    override val classes: Array<String> = arrayOf(classname)
+
+    object Two : UIKitColumn("uk-column-1-2")
+    object Three : UIKitColumn("uk-column-1-3")
+    object Four : UIKitColumn("uk-column-1-4")
+    object Five : UIKitColumn("uk-column-1-5")
+    object Six : UIKitColumn("uk-column-1-6")
+
+    object Divider : UIKitColumn("uk-column-divider")
+
+    object Span : UIKitColumn("uk-column-span")
+}