Outline for cargo chapter

src/ch14-00-more-about-cargo.md

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+# More about Cargo and Crates.io
+
+## Getting your project ready to be published on Crates.io
+
+(and publish itself)
+
+### Metadata in your Cargo.toml
+
+### Versions
+
+- yank
+
+### `pub use`
+
+### Doc Comments
+
+## Release profiles
+
+## Cargo Workspaces
+
+## `cargo install` and Cargo Extensions