Add repo links to Cargo.toml

Author: GabrielMajeri

Cargo.toml

@@ -6,5 +6,8 @@ license = "Apache-2.0/MIT"
 description = "Lightweight Datalog engine intended to be embedded in other Rust programs"
 readme = "README.md"
 keywords = ["datalog", "analysis"]
+repository = "https://github.com/rust-lang-nursery/datafrog"
 
-[dependencies]
+[badges]
+is-it-maintained-issue-resolution = { repository = "https://github.com/rust-lang-nursery/datafrog" }
+is-it-maintained-open-issues = { repository = "https://github.com/rust-lang-nursery/datafrog" }