add all brand assets

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+# Assets
+Sigsum's brand assets are included here.  Use responsibly.
+
+## Font
+
+A geometric sans-serif font named [outfit][].  It is [SIL OFL][] licensed.
+
+[outfit]: https://outfit.io/outfit-font
+[SIL OFL]: https://github.com/Outfitio/Outfit-Fonts/blob/main/OFL.txt
+
+## Colors
+
+The color codes are:
+
+  - \#FAF9F5, rgba(250, 249, 245, 1)
+  - \#333333, rgba(51, 51, 51, 1)
+  - \#DB4D2C, rgba(219, 77, 44, 1)
+  - \#581303, rgba(219, 77, 44, 1)
+  - \#6B60E3, rgba(107, 96, 227, 1)
+
+## Visuals
+All visuals are [CC BY-SA 4.0][] licensed.
+
+[CC BY-SA 4.0]: https://creativecommons.org/licenses/by-sa/4.0/
+
+## Avatar
+![Sigsum avatar](avatar.svg =100x)
+
+## Logo
+### Plain
+![Sigsum logo plain](logo.svg =300x)
+
+### Light background
+![Sigsum logo background gray](logo-light.svg =400x)
+
+### Orange background
+![Sigsum logo background orange](logo-orange.svg =400x)
+
+### Dark background
+![Sigsum logo background dark orange](logo-dark.svg =400x)
+
+## Acknowledgment
+Lars Wästfelt developed Sigsum's brand assets.