feat: Adds section and section style, needs tests

Sources/CliDoc/Nodes/ExampleSection.swift

@@ -0,0 +1,51 @@
+import Rainbow
+
+public struct ExampleSection<Header: TextNode, Label: TextNode>: TextNode {
+  public typealias Example = (label: String, example: String)
+
+  @usableFromInline
+  let examples: [Example]
+
+  @usableFromInline
+  let header: Header
+
+  @usableFromInline
+  let label: Label
+
+  @inlinable
+  public init(
+    examples: [Example],
+    @TextBuilder header: () -> Header,
+    @TextBuilder label: () -> Label
+  ) {
+    self.examples = examples
+    self.header = header()
+    self.label = label()
+  }
+
+  @inlinable
+  public var body: some TextNode {
+    style(.default())
+  }
+}
+
+public extension ExampleSection where Header == String, Label == String {
+  @inlinable
+  init(
+    header: String = "Examples:".yellow.bold,
+    label: String = "Some common usage examples.",
+    examples: [Example]
+  ) {
+    self.init(examples: examples) { header } label: { label }
+  }
+
+  @inlinable
+  init(
+    header: String = "Examples:".yellow.bold,
+    label: String = "Some common usage examples.",
+    examples: Example...
+  ) {
+    self.init(header: header, label: label, examples: examples)
+  }
+
+}