added multithreaded version by Shawn Bayern

index.html

@@ -132,6 +132,7 @@ <h1>xxHash</h1>
 |__C++__ constexpr (XXH64)  |Daniel Kirchner    |https://github.com/ekpyron/xxhashct
 |__C++__ constexpr (XXH32)  |Takayuki Matsuoka  |https://github.com/Cyan4973/xxHash/issues/496
 |__C++__ constexpr (XXH3)   |chys87             |https://github.com/chys87/constexpr-xxh3
+|__C__ multithreaded        |Shawn Bayern       |https://github.com/shawnbayern/xxHash
 |__Java__                   |Adrien Grand       |https://github.com/lz4/lz4-java/tree/master/src/java/net/jpountz/xxhash
 |__Java__ (XXH3, XXH128)    |James Z.M. Gao     |https://github.com/OpenHFT/Zero-Allocation-Hashing/blob/master/src/main/java/net/openhft/hashing/XXH3.java
 |__Java__ (XXH3, port)      |Otmar Ertl         |https://github.com/dynatrace-oss/hash4j/blob/main/src/main/java/com/dynatrace/hash4j/hashing/XXH3_64.java