cmake: add ZSTD module

cmake/FindZSTD.cmake

@@ -0,0 +1,21 @@
+# taken from: https://github.com/facebook/folly/blob/master/CMake/FindZstd.cmake
+# SPDX-FileCopyrightText: Facebook, Inc. and its affiliates.
+# SPDX-License-Identifier: Apache-2.0
+#
+# - Try to find Facebook zstd library
+# This will define
+# ZSTD_FOUND
+# ZSTD_INCLUDE_DIR
+# ZSTD_LIBRARY
+#
+
+find_path(ZSTD_INCLUDE_DIR NAMES zstd.h)
+find_library(ZSTD_LIBRARY NAMES zstd)
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(
+    ZSTD DEFAULT_MSG
+    ZSTD_LIBRARY ZSTD_INCLUDE_DIR
+)
+
+mark_as_advanced(ZSTD_INCLUDE_DIR ZSTD_LIBRARY)