docs: add Android & iOS to working examples (#2811)

docs/data/readme_icons/android.svg

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+<svg xmlns="http://www.w3.org/2000/svg" role="img" viewBox="0 0 24 24" width="16px" fill="#606060"><title>Android icon</title><path d="M17.523 15.3414c-.5511 0-.9993-.4486-.9993-.9997s.4483-.9993.9993-.9993c.5511 0 .9993.4483.9993.9993.0001.5511-.4482.9997-.9993.9997m-11.046 0c-.5511 0-.9993-.4486-.9993-.9997s.4482-.9993.9993-.9993c.5511 0 .9993.4483.9993.9993 0 .5511-.4483.9997-.9993.9997m11.4045-6.02l1.9973-3.4592a.416.416 0 00-.1521-.5676.416.416 0 00-.5676.1521l-2.0223 3.503C15.5902 8.2439 13.8533 7.8508 12 7.8508s-3.5902.3931-5.1367 1.0989L4.841 5.4467a.4161.4161 0 00-.5677-.1521.4157.4157 0 00-.1521.5676l1.9973 3.4592C2.6889 11.1867.3432 14.6589 0 18.761h24c-.3435-4.1021-2.6892-7.5743-6.1185-9.4396"/></svg>

docs/data/readme_icons/ios.svg

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+<svg xmlns="http://www.w3.org/2000/svg" role="img" viewBox="0 0 24 24" width="16px" fill="#606060"><title>iOS icon</title><path d="M1.1 6.05C.486 6.05 0 6.53 0 7.13A1.08 1.08 0 0 0 1.1 8.21C1.72 8.21 2.21 7.73 2.21 7.13C2.21 6.53 1.72 6.05 1.1 6.05M8.71 6.07C5.35 6.07 3.25 8.36 3.25 12C3.25 15.67 5.35 17.95 8.71 17.95C12.05 17.95 14.16 15.67 14.16 12C14.16 8.36 12.05 6.07 8.71 6.07M19.55 6.07C17.05 6.07 15.27 7.45 15.27 9.5C15.27 11.13 16.28 12.15 18.4 12.64L19.89 13C21.34 13.33 21.93 13.81 21.93 14.64C21.93 15.6 20.96 16.28 19.58 16.28C18.17 16.28 17.11 15.59 17 14.53H15C15.08 16.65 16.82 17.95 19.46 17.95C22.25 17.95 24 16.58 24 14.4C24 12.69 23 11.72 20.68 11.19L19.35 10.89C17.94 10.55 17.36 10.1 17.36 9.34C17.36 8.38 18.24 7.74 19.54 7.74C20.85 7.74 21.75 8.39 21.85 9.46H23.81C23.76 7.44 22.09 6.07 19.55 6.07M8.71 7.82C10.75 7.82 12.06 9.45 12.06 12C12.06 14.57 10.75 16.2 8.71 16.2C6.65 16.2 5.35 14.57 5.35 12C5.35 9.45 6.65 7.82 8.71 7.82M.111 9.31V17.76H2.1V9.31H.11Z"/></svg>