Smiley Face Part I
A static SVG smiley face is drawn as a yellow circle with a black outline, accompanied by two filled black circles for eyes. The example demonstrates basic React rendering by defining an `App` component that returns the SVG markup, though it does not render to the DOM. It uses React 17 and uses SVG circle elements with explicit `cx`, `cy`, `r`, `fill`, and `stroke` attributes. The code is an introductory illustration of embedding SVG primitives within a React component structure.