go wrapper for zstd (library)

 This package provides Go bindings for the libzstd C library.
 .
 Features:
  * Simple API.
  * Optimized for speed. The API may be easily used in zero allocations mode.
  * Compress* and Decompress* functions are optimized for high concurrency.
  * Proper Writer.Flush for network apps.
  * Supports the following features from upstream zstd:
    - Block / stream compression / decompression with all the supported
      compression levels and with dictionary support.
    - Dictionary building from a sample set. The created dictionary may be
      saved to persistent storage / transferred over the network.
    - Dictionary loading for compression / decompression.
 .
 There is also StreamCompress and Writer for stream compression and
 StreamDecompress and Reader for stream decompression.