Updated README.md to include Mobius logo(s)

Added both light and dark versions of the Mobius logo at the beginning of the read me.  These should change depending on the system theme (MacOS appearance Light/Dark for example) as per Github docs: https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#specifying-the-theme-an-image-is-shown-to

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+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/190136/173893691-349dcf82-4fbe-431f-966b-c54817770f66.png">
+  <source media="(prefers-color-scheme: light)" srcset="https://user-images.githubusercontent.com/190136/173893686-d07f72a6-2822-4e4b-9d61-7ba7019ba706.png">
+</picture>
+
 # Mobius
 
 Mobius is a cross-platform command line [Hotline](https://en.wikipedia.org/wiki/Hotline_Communications) client and server implemented in Golang.