Document -Z crate-attr

Co-authored-by: Vadim Petrochenkov <[email protected]>

Author: jyn514

Diff for: src/doc/unstable-book/src/compiler-flags/crate-attr.md

@@ -0,0 +1,16 @@
+# `crate-attr`
+
+The tracking issue for this feature is: [#138287](https://github.com/rust-lang/rust/issues/138287).
+
+------------------------
+
+The `-Z crate-attr` flag allows you to inject attributes into the crate root.
+For example, `-Z crate-attr=crate_name="test"` acts as if `#![crate_name="test"]` were present before the first source line of the crate root.
+
+To inject multiple attributes, pass `-Z crate-attr` multiple times.
+
+Formally, the expansion behaves as follows:
+1. The crate is parsed as if `-Z crate-attr` were not present.
+2. The attributes in `-Z crate-attr` are parsed.
+3. The attributes are injected at the top of the crate root.
+4. Macro expansion is performed.