create Logo (#567)

lmiq · sostock · web-flow · commit 0c53db88abcb · 2023-03-11T13:23:32.000+01:00
* added logo.svg

* add logo to readme

* add logo to readme

* added logo to readme

* removed logo from readme

* add "About the logo" to main page

* Update docs/src/index.md

Co-authored-by: Sebastian Stock &lt;42280794+sostock@users.noreply.github.com&gt;

---------

Co-authored-by: Sebastian Stock &lt;42280794+sostock@users.noreply.github.com&gt;
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diff --git a/docs/src/index.md b/docs/src/index.md
@@ -118,3 +118,8 @@ A^2 s^4 kg^-1 m^-3
     temperature differences.
 
 See `test/runtests.jl` for more usage examples.
+
+## About the logo
+
+The logo is a pictorial representation of the [International Prototype of the Kilogram](https://en.wikipedia.org/wiki/International_Prototype_of_the_Kilogram), which was the standard definition of one kilogram from 1889 to 2019,
+when it was replaced by a definition based on the Planck constant, the speed of light, and the ground-state hyperfine transition frequency of ¹³³Cs.
