IronSnappy 1.0.0

This is a native .NET port of [Google Snappy](https://github.com/google/snappy) compression/decompression library. The only implementation that is stable, fast, up to date with latest Snappy improvements, and most importantly *does not depend on native Snappy binaries*. It is originally ported from the [Golang implementation](https://github.com/golang/snappy/) because Go is much easier to understand and work with comparing to C++. The library passes *golden tests* from the original implementation i.e. compares that compression/decompression is fully compatible with the original implementation. Internally, it is using array pooling and spans for efficient memory allocation and low GC pressure.