clang-tidy module: copy .gitignore from top level

Since 8b094845, .gitignore entries have been pinned to the top-level
.gitignore file. Copy these entries into a .gitignore for the
clang-tidy module.

Utilities/ClangTidyModule/.gitignore

@@ -0,0 +1,8 @@
+/CMakeUserPresets.json
+
+# Common build directories
+/build*/
+
+# Visual Studio Code
+/.vscode/
+/.cache/