EROFS-Utils Adds LZ4 Compression Bits, Finally Has A README

While initially the user-space utility for Huawei's EROFS file-system was not publicly available, it came last November and this past April they began rewriting these EROFS user-space bits. Fortunately, since then they have done a better job of keeping EROFS-utils up-to-date against their latest kernel module changes for this read-only file-system...