Add png feature (#3677)

Co-authored-by: Patrick Brosset <patrickbrosset@gmail.com>

Author: ddbeck

features/png.yml

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+name: PNG
+description: The PNG (Portable Network Graphics) image format is a raster graphics file format with animation, alpha transparency, and lossless compression.
+spec: https://w3c.github.io/png/#Introduction
+caniuse:
+  - png-alpha
+  - link-icon-png
+  - apng
+compat_features:
+  - mediatypes.image.png
+  - mediatypes.image.png.animation

features/png.yml.dist

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+# Generated from: png.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "3"
+    firefox_android: "4"
+    safari: "8"
+    safari_ios: "8"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - mediatypes.image.png
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3"
+  #   firefox_android: "4"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - mediatypes.image.png.animation