Initial project import

tools/v/vlib/hash/README.md

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+## Description
+
+`hash` provides a way to hash binary data, i.e. produce a shorter value,
+that is highly content dependent, so even slightly different content will
+produce widely different hashes.
+
+Hash functions are useful for implementing maps, caches etc.
+
+## Available submodules
+
+- `hash.adler32` - Adler-32 (RFC 1950 checksum used by zlib)
+- `hash.crc32` - CRC-32 variants (IEEE 802.3 `crc32`, Castagnoli `crc32c`, Koopman `crc32k`,
+  CRC-32Q `crc32q`)
+- `hash.crc64` - CRC-64-ECMA-182
+- `hash.fnv1a` - Fowler-Noll-Vo hashes