Add unmaintained badge (#1428)

crates/badge/RUSTSEC-0000-0000.md

@@ -0,0 +1,27 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "badge"
+date = "2022-08-31"
+url = "https://github.com/rust-lang/docs.rs/issues/1813#issuecomment-1232875809"
+informational = "unmaintained"
+
+[versions]
+patched = []
+```
+# badge is Unmaintained
+
+The maintainer has adviced this crate is deprecated and will not receive any maintenance.
+
+The crate depends on the deprecated `rusttype` crate and won't receive updates
+anymore.
+
+## Possible Alternative(s)
+
+ The below list has not been vetted in any way and may or may not contain alternatives;
+
+ - [badge-maker](https://crates.io/crates/badge-maker)
+ - [badgeland](https://crates.io/crates/badgeland)
+ - [badgen](https://crates.io/crates/badgen)
+ - [badgers](https://crates.io/crates/badgers) (API compatible fork of the `badge` crate using `ab_glyph` as a replacement for `rusttype`)
+ - [rsbadges](https://crates.io/crates/rsbadges) (used deprecated `rusttype`)