feat: Working on node builder

Sources/CliDoc/Modifiers/Color.swift

@@ -0,0 +1,35 @@
+import Rainbow
+
+public extension NodeRepresentable {
+
+  @inlinable
+  func color(_ color: NamedColor) -> any NodeRepresentable {
+    modifier(ColorModifier(color: color))
+  }
+
+}
+
+public extension NodeModifier {
+
+  @inlinable
+  static func color(_ color: NamedColor) -> Self where Self == AnyNodeModifier {
+    .init(ColorModifier(color: color))
+  }
+
+}
+
+@usableFromInline
+struct ColorModifier: NodeModifier, @unchecked Sendable {
+  @usableFromInline
+  let color: NamedColor
+
+  @usableFromInline
+  init(color: NamedColor) {
+    self.color = color
+  }
+
+  @usableFromInline
+  func render(_ node: any NodeRepresentable) -> any NodeRepresentable {
+    node.render().applyingColor(color)
+  }
+}