README: Add a logo

Add a project logo per discussion with other maintainers.

.readme.tmpl

@@ -1,7 +1,15 @@
 # :zap: zap [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
 
+<div align="center">
+
 Blazing fast, structured, leveled logging in Go.
 
+![Zap logo](assets/logo.png)
+
+[![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
+
+</div>
+
 ## Installation
 
 `go get -u go.uber.org/zap`

README.md

@@ -1,7 +1,16 @@
-# :zap: zap [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
+# :zap: zap
+
+
+<div align="center">
 
 Blazing fast, structured, leveled logging in Go.
 
+![Zap logo](assets/logo.png)
+
+[![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
+
+</div>
+
 ## Installation
 
 `go get -u go.uber.org/zap`

assets/README.md

@@ -0,0 +1,5 @@
+The logo for Zap was designed by [Abhinav Gupta](https://abhinavg.net/)
+and is made available under the Creative Commons 4.0 Attribution License.
+
+It is based on the Go Gopher mascot originally created by Renee French,
+which is also licensed under the Creative Commons 4.0 Attribution License.

assets/go.mod

@@ -0,0 +1,3 @@
+module go.uber.org/zap/assets
+
+go 1.21.5