Merge pull request #28 from xTibor/patch-1

Add badges to README.md

README.md

-[Redox OS][1]'s syscall API
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-[Documentation][2]
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-[1]: https://github.com/redox-os/redox
-[2]: https://docs.rs/redox_syscall
+# syscall
+[Redox OS](https://github.com/redox-os/redox)'s syscall API
 
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
+[![crates.io](http://meritbadge.herokuapp.com/redox_syscall)](https://crates.io/crates/redox_syscall)
+[![docs.rs](https://docs.rs/redox_syscall/badge.svg)](https://docs.rs/redox_syscall)