Add sample SHR conversions

examples/shr/gallery.md

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+# Gallery of Super Hi-Res images
+
+Here are some more Super Hi-Res images converted with ][-pix.
+
+* (left) original image
+* (right) converted image
+
+| ![Bee collecting pollen](bee-collecting-pollen.jpg) | ![Bee collecting pollen](bee-collecting-pollen-preview.png) |
+|---|---|
+(Source: [Jon Sullivan](https://commons.wikimedia.org/wiki/File:Bee_Collecting_Pollen_2004-08-14.jpg), public domain, via Wikimedia Commons)
+
+| ![Canis Mesomelas](canis-mesomelas.jpg) | ![Canis Mesomelas](canis-mesomelas-preview.png) |
+|---|---|
+(Source: [Hans Hillewaert](https://nl.m.wikipedia.org/wiki/Bestand:Canis_mesomelas.jpg), licensed under [Creative Commons Attribution-Share Alike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/deed.en) via Wikimedia Commons)
+
+| ![Portrait](portrait.jpg) | ![Portrait](portrait-preview.png) |
+|---|---|
+(Source: [Devanath](https://www.pikist.com/free-photo-srmda/fr), public domain)
+
+| ![Mandarin duck](mandarin-duck.jpg) | ![Mandarin duck](mandarin-duck-preview.png) |
+|---|---|
+(Source: [Adrian Pingstone](https://commons.wikimedia.org/wiki/File:Mandarin.duck.arp.jpg), public domain, via Wikimedia Commons)
+
+| ![Brooklyn bridge](brooklyn-bridge.jpg) | ![Brooklyn bridge](brooklyn-bridge-preview.png) |
+|---|---|
+(Source: [Andrew Choy](https://commons.wikimedia.org/wiki/File:Brooklyn_Bridge_at_Night.jpg), licensed under [Creative Commons Attribution-Share Alike 2.0 Generic](https://creativecommons.org/licenses/by-sa/2.0/deed.en), via Wikimedia Commons)
+
+| ![Barbados beach](barbados-beach.jpg) | ![Barbados beach](barbados-beach-preview.png) |
+|---|---|
+
+(Source: [Berit](https://commons.wikimedia.org/wiki/File:Barbados_beach_(6735320631).jpg), licensed under the [Creative Commons Attribution 2.0 Generic license](https://creativecommons.org/licenses/by/2.0/deed.en), via Wikimedia Commons)
+
+| ![Audi e-tron](audi-e-tron.jpg) | ![Audi e-tron](audi-e-tron-preview.png) |
+|---|---|
+(Source: [Thomas Wolf](https://commons.wikimedia.org/wiki/File:Audi_e-tron.jpg), licensed under [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/deed.de) via Wikimedia Commons)