Add repository link to Cargo.toml (#60)

Cargo.toml

@@ -4,6 +4,7 @@ version = "0.8.0"
 authors = ["Philipp Oppermann <dev@phil-opp.com>", "Calvin Lee <cyrus296@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "An experimental Multiboot 2 crate for ELF-64/32 kernels."
+repository = "https://github.com/rust-osdev/multiboot2-elf64"
 
 [dependencies]
 bitflags = "1.0.0"