Add an example of LZ4FrameOutputStream and LZ4FrameOutputStream (#139)

Author: odaira

README.md

@@ -43,7 +43,7 @@ Have a look at LZ4Factory for more information.
    especially if CPU endianness differs, but the compressed streams can be
    safely decompressed by any decompressor implementation on any platform.
 
-## Example
+## Examples
 
 ```java
 LZ4Factory factory = LZ4Factory.fastestInstance();
@@ -71,6 +71,20 @@ int decompressedLength2 = decompressor2.decompress(compressed, 0, compressedLeng
 // decompressedLength == decompressedLength2
 ```
 
+```java
+byte[] data = "12345345234572".getBytes("UTF-8");
+final int decompressedLength = data.length;
+
+LZ4FrameOutputStream outStream = new LZ4FrameOutputStream(new FileOutputStream(new File("test.lz4")));
+outStream.write(data);
+outStream.close();
+
+byte[] restored = new byte[decompressedLength];
+LZ4FrameInputStream inStream = new LZ4FrameInputStream(new FileInputStream(new File("test.lz4")));
+inStream.read(restored);
+inStream.close();
+```
+
 # xxhash Java
 
 xxhash hashing for Java, based on Yann Collet's work available at https://github.com/Cyan4973/xxHash (old version