Add documentation link

Author: joshchoo

Cargo.toml

@@ -7,6 +7,7 @@ description = """
 A tool to identify required blobs (.so) that are missing from AOSP ROM builds, and to show which existing blobs depend on them.
 """
 license = "MIT"
+documentation = "https://github.com/joshuous/aosp-missing-blobs"
 homepage = "https://github.com/joshuous/aosp-missing-blobs"
 repository = "https://github.com/joshuous/aosp-missing-blobs"