Update bridge_png for publish

Author: CraftSpider

crates/bridge_png/Cargo.toml

@@ -5,6 +5,13 @@ name = "tectonic_bridge_png"
 version = "0.0.0-dev.0"
 edition = "2021"
 links = "png"
+description = """
+Exposing PNG APIs to the Tectonic C/C++ and Rust code.
+"""
+homepage = "https://tectonic-typesetting.github.io/"
+documentation = "https://docs.rs/tectonic_bridge_png"
+repository = "https://github.com/tectonic-typesetting/tectonic/"
+readme = "README.md"
 
 [build-dependencies]
 tectonic_dep_support = { path = "../dep_support", version = "0.0.0-dev.0" }

crates/bridge_png/README.md

@@ -0,0 +1,11 @@
+# The `tectonic_bridge_png` create
+
+This crate is part of
+[the Tectonic project](https://tectonic-typesetting.github.io/en-US/). It exposes
+PNG APIs into Rust code safely, as well as the *C* API
+of the [PNG] image library within the Rust/Cargo build framework.
+
+[![](http://meritbadge.herokuapp.com/tectonic_bridge_png)](https://crates.io/crates/tectonic_bridge_png)
+
+- [API documentation](https://docs.rs/tectonic_bridge_png/).
+- [Main Git repository](https://github.com/tectonic-typesetting/tectonic/).