Add clang-tidy file

Author: urbytes21

.clang-tidy

@@ -0,0 +1,46 @@
+# Apply to ALL headers (empty = no restriction)
+HeaderFilterRegex: '.*'
+
+# Treat warnings as errors (optional but recommended for CI)
+# WarningsAsErrors: '*'
+WarningsAsErrors: ''
+
+Checks: >
+  -*,
+  clang-diagnostic-*,
+  modernize-*,
+  -modernize-use-trailing-return-type,
+  -modernize-use-auto,
+  cppcoreguidelines-*,
+  -cppcoreguidelines-owning-memory,
+  -cppcoreguidelines-pro-type-vararg,
+  -cppcoreguidelines-avoid-magic-numbers,
+  bugprone-*,
+  performance-*,
+  readability-*,
+  -readability-magic-numbers,
+  -readability-identifier-length,
+  misc-*,
+  -misc-unused-parameters
+
+CheckOptions:
+  - key: readability-identifier-naming.NamespaceCase
+    value: lower_case
+
+  - key: readability-identifier-naming.ClassCase
+    value: CamelCase
+
+  - key: readability-identifier-naming.StructCase
+    value: CamelCase
+
+  - key: readability-identifier-naming.FunctionCase
+    value: lower_case
+
+  - key: readability-identifier-naming.VariableCase
+    value: lower_case
+
+  - key: readability-identifier-naming.MemberCase
+    value: lower_case_
+
+  - key: modernize-use-nullptr.NullMacros
+    value: 'NULL'