Add a petgraph logo (petgraph#598)

Author: indietyp

README.md

@@ -1,10 +1,16 @@
+![](assets/graphosaurus-512.png)
+
 # petgraph
 
 Graph data structure library. Please read the [API documentation here][].
 
 Supports Rust 1.64 and later.
 
-[![build_status][]](https://github.com/petgraph/petgraph/actions) [![crates][]](https://crates.io/crates/petgraph) [![gitter][]](https://gitter.im/petgraph-rs/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+[![Crates.io][crates-badge]][crates-url]
+[![docs.rs][docsrs-badge]][docsrs-url]
+![MSRV][msrv-badge]
+[![Discord chat][discord-badge]][discord-url]
+[![build_status][]](https://github.com/petgraph/petgraph/actions)
 
 Crate feature flags:
 
@@ -20,6 +26,11 @@ Crate feature flags:
 See [RELEASES][] for a list of changes. The minimum supported rust
 version will only change on major releases.
 
+## Logo
+
+The mascot is named "Sir Paul Rustory Graphosaurus" (close friends call him Paul).
+The logo has been created by the talented Aren.
+
 ## License
 
 Dual-licensed to be compatible with the Rust project.
@@ -29,8 +40,13 @@ Licensed under the Apache License, Version 2.0
 <http://opensource.org/licenses/MIT>, at your option. This file may not
 be copied, modified, or distributed except according to those terms.
 
-  [API documentation here]: https://docs.rs/petgraph/
-  [build_status]: https://github.com/petgraph/petgraph/workflows/Continuous%20integration/badge.svg?branch=master
-  [crates]: https://img.shields.io/crates/v/petgraph
-  [gitter]: https://badges.gitter.im/petgraph-rs/community.svg
-  [RELEASES]: RELEASES.rst
+[API documentation here]: https://docs.rs/petgraph/
+[build_status]: https://github.com/petgraph/petgraph/workflows/Continuous%20integration/badge.svg?branch=master
+[docsrs-badge]: https://img.shields.io/docsrs/petgraph
+[docsrs-url]: https://docs.rs/petgraph/latest/petgraph/
+[crates-badge]: https://img.shields.io/crates/v/petgraph.svg
+[crates-url]: https://crates.io/crates/petgraph
+[discord-badge]:  https://img.shields.io/discord/1166289348384280616?logo=discord&style=flat
+[discord-url]: https://discord.gg/n2tc79tJ4e
+[msrv-badge]: https://img.shields.io/badge/rustc-1.64+-blue.svg
+[RELEASES]: RELEASES.rst

assets/LICENSE.md

@@ -0,0 +1,7 @@
+Graphosaurus (c) by the petgraph project.
+
+Graphosaurus is licensed under a
+Creative Commons Attribution-ShareAlike 4.0 International License.
+
+You should have received a copy of the license along with this
+work.  If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.