Create README.md

Author: Cosmo

README.md

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+<img src="https://raw.githubusercontent.com/Cosmo/BinaryKit/master/BinaryKitLogo.png" alt=" text" width="100" />
+
+# BinaryKit
+Access bits and bytes directly in Swift.
+
+## Usage
+
+Initialize from `NSData`
+```swift
+let data   = NSData(...)
+let binary = Binary(data: data)
+```
+
+or `[UInt8]` bytes array
+```swift
+let binary = Binary(bytes: [0xDE, 0xAD]) // 1101 1110 1010 1101
+```
+
+```swift
+// Bits
+binary.bit(0) as Int      // 1
+binary.bit(1) as Int      // 1
+binary.bit(2) as Bit      // .Zero
+binary.bit(3) as Bit      // .One
+binary.bits(0, 16)        // 57005 
+
+// Bytes
+binary.byte(0) as Int     // 222
+binary.byte(0, 2) as Int  // 57005
+```
+
+## Todos
+
+- [ ] Endianness flag
+- [ ] Tests
+- [ ] Documentation
+
+## License
+
+BinaryKit is released under the [MIT License](http://www.opensource.org/licenses/MIT).