Initial project import

tools/v/thirdparty/zstd/fix.md

@@ -0,0 +1,7 @@
+The changes here are produced by modifying `thirdparty/zstd/zstd_v.patch`,
+and then running `v thirdparty/zstd/update.vsh` .
+
+You can generate a new patch by:
+`diff -u zstd-1.5.7/build/single_file_libs/zstd.c thirdparty/zstd/zstd.c > zstd_custom.patch`
+
+BTW, patch is between `/* >> v_patch start */` and `/* << v_patch end */` mostly.