[misc] add clang-tidy (#15)

.clang-tidy

@@ -0,0 +1,24 @@
+Checks: '-*,clang-diagnostic-*,llvm-*,misc-*,-misc-const-correctness,-misc-unused-parameters,-misc-non-private-member-variables-in-classes,-misc-no-recursion,-misc-use-anonymous-namespace,readability-identifier-naming,-misc-include-cleaner'
+CheckOptions:
+- key: readability-identifier-naming.ClassCase
+  value: CamelCase
+- key: readability-identifier-naming.EnumCase
+  value: CamelCase
+- key: readability-identifier-naming.FunctionCase
+  value: camelBack
+- key: readability-identifier-naming.MemberCase
+  value: camelBack
+- key: readability-identifier-naming.ParameterCase
+  value: camelBack
+- key: readability-identifier-naming.UnionCase
+  value: camelBack
+- key: readability-identifier-naming.VariableCase
+  value: camelBack
+- key: readability-identifier-naming.ConstantCase
+  value: UPPER_CASE
+- key: readability-identifier-naming.IgnoreMainLikeFunctions
+  value: 1
+- key: readability-redundant-member-init.IgnoreBaseInCopyConstructors
+  value: 1
+- key: modernize-use-default-member-init.UseAssignment
+  value: 1