feat: add cosine wave visualization to simulate/iter/cosine-wave

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Author: kaushal-kumar-it

lib/node_modules/@stdlib/simulate/iter/cosine-wave/README.md

@@ -43,7 +43,10 @@ f(t; \tau, a, \varphi) = a \cos \frac{2\pi(t-\varphi)}{\tau}
 
 where `τ` is the period, `a` is the peak amplitude, and `φ` is the phase offset.
 
-<!-- TODO: add a figure showing a sine wave -->
+<!-- <div class="image" align="center">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@39a75d78bc004d21624ab73b86c6a8f4fa47faba/lib/node_modules/@stdlib/simulate/iter/cosine-wave/docs/img/cosine_wave.svg" alt="Cosine waveform over two periods.">
+    <br>
+</div> -->
 
 </section>