Add licence and readme.

Author: ctamblyn

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2013 Mozilla Foundation
+
+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

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+# `bit-iter`
+
+Iterate over the bits set in a word.
+
+A `BitIter` may be constructed from any integral value.
+
+## Example
+
+```rust
+fn main() {
+    use bit_iter::*;
+
+    let x : u32 = 0x10001;
+
+    for b in BitIter::from(x) {
+        println!("Bit {} is set.", b);
+    }
+}
+```
+
+Output:
+
+```text
+Bit 0 is set.
+Bit 16 is set.
+```