Add cmake file

.gitignore

@@ -33,7 +33,6 @@ CMakeCache.txt
 CMakeFiles/
 cmake_install.cmake
 Makefile
-*.cmake
 
 # IDE specific files
 .vscode/
@@ -56,4 +55,4 @@ Thumbs.db
 
 # Dependencies
 deps/
-vendor/ 
+vendor/ 

cmake/FindxxHash.cmake

@@ -0,0 +1,38 @@
+# Find xxHash library
+#
+# This sets the following variables:
+#   xxHash_FOUND - True if xxHash was found
+#   xxHash_INCLUDE_DIRS - xxHash include directories
+#   xxHash_LIBRARIES - xxHash libraries
+
+find_path(xxHash_INCLUDE_DIR
+    NAMES xxhash.h
+    PATHS
+        /usr/include
+        /usr/local/include
+        /opt/local/include
+        ${CMAKE_INSTALL_PREFIX}/include
+    PATH_SUFFIXES xxhash
+)
+
+find_library(xxHash_LIBRARY
+    NAMES xxhash libxxhash
+    PATHS
+        /usr/lib
+        /usr/local/lib
+        /opt/local/lib
+        ${CMAKE_INSTALL_PREFIX}/lib
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(xxHash
+    FOUND_VAR xxHash_FOUND
+    REQUIRED_VARS xxHash_LIBRARY xxHash_INCLUDE_DIR
+)
+
+if(xxHash_FOUND)
+    set(xxHash_LIBRARIES ${xxHash_LIBRARY})
+    set(xxHash_INCLUDE_DIRS ${xxHash_INCLUDE_DIR})
+endif()
+
+mark_as_advanced(xxHash_INCLUDE_DIR xxHash_LIBRARY)