Add Neovide logo (#519)

* Add Neovim Logo as an SVG asset

This logo was created in Inkscape by combining the Rust logo's gear ring
with the Neovim logo.

* Add rendered PNG versions of the Neovide logo

Rendered using Inkscape from the original SVG.

* Add assets README with license information

The CC-BY 3.0 and 4.0 licenses (used by me, the Rust project, and the
Neovim project) all require attribution, which we do in this document.
Specifically, they require:

  * Appropriate credit -- e.g., creator name and link
  * Indication if and what changes were made to the original

assets/README.md

@@ -0,0 +1,31 @@
+# Neovide Assets
+
+This directory contains assets shared under various open licenses.
+
+## Neovide Logo
+
+The [Neovide logo][neovide-logo] was created by [Chris
+Bouchard][chris-bouchard], and is shared under the [Creative Commons
+Attribution v4.0 license (CC-BY)][cc-by-4.0].
+
+Our logo contains a modified version of the Rust logo — namely the
+outer gear ring. The [Rust logo][rust-logo] is © Mozilla. It is licensed
+under the [Creative Commons Attribution v4.0 license (CC-BY)][cc-by-4.0], and
+is used according to [Rust's trademark policy][rust-media-guide].
+
+Our logo also contains a modified version of the Neovim logo, with the bottom
+portion obscured by the gear ring. The [Neovim][neovim] logo is © [Jason
+Long][jason-long]. It is licensed under the [Creative Commons Attribution 3.0
+Unported License][cc-by-3.0].
+
+[neovide-logo]: ./neovide.svg
+
+[chris-bouchard]: https://github.com/chrisbouchard
+[jason-long]: https://twitter.com/jasonlong
+[neovim]: https://neovim.io/
+[rust-logo]: https://github.com/rust-lang/rust-artwork/tree/master/logo
+[rust-media-guide]: https://www.rust-lang.org/policies/media-guide
+
+[cc-by-4.0]: https://creativecommons.org/licenses/by/4.0/
+[cc-by-3.0]: https://creativecommons.org/licenses/by/3.0/
+

assets/neovide.svg

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