Added LICENSE and README.

LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2017 Jose Narvaez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

+# users
+
+API for accessing users and groups functionality in Redox.
+
+High level APIs for things like:
+
+- Getting the current process effective user ID.
+- Getting the current process user ID.
+- Getting the current process effective group ID.
+- Getting the current process group ID.
+- Getting the user information for a given user ID.
+- Getting the group information for a given group ID.
+- Getting the user information for a given username.
+- Getting a group information for a given group name.
+
+We recommend to user these APIs instead of directly manipulating
+`/etc/group` and `etc/passwd` as this is an implementation detail and
+might change in the future.
+
+## Using users
+
+Make sure you have Rust nightly.
+
+Add `rust_users` to `Cargo.toml`:
+
+```toml
+[dependencies.ralloc]
+git = "https://github.com/redox-os/users.git"
+```
+
+then import it in your main file:
+
+```rust
+extern crate rust_users;
+```
+
+`rust_users` is now ready to roll!
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