Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Single File ZStandard Examples
+
+The examples `#include` the generated `zstddeclib.c` directly but work equally as well when including `zstd.h` and compiling the amalgamated source separately.
+
+`simple.c` is the most basic example of decompressing content and verifying the result.
+
+`emscripten.c` is a bare-bones [Emscripten](https://github.com/emscripten-core/emscripten) compiled WebGL demo using Zstd to further compress a DXT1 texture (see the [original PNG image](testcard.png)). The 256x256 texture would normally be 32kB, but even when bundled with the Zstd decompressor the resulting WebAssembly weighs in at 41kB (`shell.html` is a support file to run the Wasm).
+
+`roundtrip.c` is an example to use with the optional [amalgamated library](../create_single_file_library.sh) showing compression the decompression.
+
+The example files in this directory are released under a [Creative Commons Zero license](https://creativecommons.org/publicdomain/zero/1.0/) (or Public Domain, whichever is applicable in your jurisdiction).