Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# cargo-credential
+
+This package is a library to assist writing a Cargo credential helper, which
+provides an interface to store tokens for authorizing access to a registry
+such as https://crates.io/.
+
+Documentation about credential processes may be found at
+https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#credential-process
+
+Example implementations may be found at
+https://github.com/rust-lang/cargo/tree/master/crates/credential
+
+## Usage
+
+Create a Cargo project with this as a dependency:
+
+```toml
+# Add this to your Cargo.toml:
+
+[dependencies]
+cargo-credential = "0.1"
+```
+
+And then include a `main.rs` binary which implements the `Credential` trait, and calls
+the `main` function which will call the appropriate method of the trait:
+
+```rust
+// src/main.rs
+
+use cargo_credential::{Credential, Error};
+
+struct MyCredential;
+
+impl Credential for MyCredential {
+    /// implement trait methods here...
+}
+
+fn main() {
+    cargo_credential::main(MyCredential);
+}
+```