Add color-palette/README.md

color-palette/README.md

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+```python
+# https://iquilezles.org/articles/palettes/
+import numpy as np
+
+W, H = 800, 20
+imgs = []
+for _ in range(50):
+    a, b, c, d = np.random.rand(4, 3)
+    # b = a * b
+    # c = np.ones(3)
+    palette = lambda t: np.clip(a + b * np.cos(np.pi * (c * t + d)), 0, 1)
+    line = [palette(t) for t in np.linspace(0, 1, W)]
+    img = np.stack([line] * H)
+    img = (img * 255).astype(np.uint8)
+    imgs.append(img)
+img = np.vstack(imgs)
+__import__('PIL.Image').Image.fromarray(img)
+```