Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+Detects whether the current terminal supports [hyperlinks in terminal
+emulators](https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda).
+
+It tries to detect and support all known terminals and terminal families that
+support this. If a declaration is wrong, missing, or could be improved, please
+send a PR!
+
+## Example
+
+The API is super simple!
+
+```rust
+use supports_hyperlinks::Stream;
+
+if supports_hyperlinks::on(Stream::Stdout) {
+    println!("This terminal supports hyperlinks on stdout");
+} else {
+    println!("No hyperlinks, please");
+}
+```
+
+And that's it!
+
+## Forcing hyperlinks in tools that use `supports-hyperlinks`
+
+You may set the `FORCE_HYPERLINK` environment variable to force
+`supports-hyperlinks` to return true for its checks. If the value is `0`, this
+will force it to be _false_, instead.