first zstdmt sketch
diff --git a/lib/compress/zstdmt_compress.h b/lib/compress/zstdmt_compress.h
new file mode 100644
index 0000000..73ee379
--- /dev/null
+++ b/lib/compress/zstdmt_compress.h
@@ -0,0 +1,12 @@
+
+#include <stddef.h> /* size_t */
+
+typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
+
+ZSTDMT_CCtx *ZSTDMT_createCCtx(unsigned nbThreads);
+size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* cctx);
+
+size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ int compressionLevel);