[vscode] add a new (mostly empty) code workspace and a clang tidy file

The clang tidy file is mostly a copy of the fuchsia one, with a few
tweaks here and there.

.clang-tidy

@@ -0,0 +1,67 @@
+---
+Checks: >
+  -*,
+  bugprone-*,
+  -bugprone-easily-swappable-parameters,
+
+  clang-diagnostic-*,
+  -clang-diagnostic-unused-command-line-argument,
+
+  google-*,
+  -google-runtime-references,
+  -google-readability-todo,
+  -google-readability-braces-around-statements,
+
+  misc-*,
+  -misc-noexcept*,
+  -misc-unused-parameters,
+  -misc-const-correctness,
+  -misc-include-cleaner,
+
+  modernize-*,
+  -modernize-avoid-c-arrays,
+  -modernize-deprecated-headers,
+  -modernize-raw-string-literal,
+  -modernize-return-braced-init-list,
+  -modernize-use-auto,
+  -modernize-use-equals-delete,
+  -modernize-use-nodiscard,
+  -modernize-use-trailing-return-type,
+
+  performance-*,
+  readability-*,
+  -readability-else-after-return,
+  -readability-function-cognitive-complexity,
+  -readability-identifier-length,
+  -readability-identifier-length,
+  -readability-implicit-bool-conversion,
+  -readability-isolate-declaration,
+  -readability-magic-numbers,
+  -readability-named-parameter,
+  -readability-qualified-auto,
+  -readability-uppercase-literal-suffix,
+
+WarningsAsErrors: false
+FormatStyle:     file
+CheckOptions:
+  - key:             misc-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           '1'
+  - key:             modernize-loop-convert.MaxCopySize
+    value:           '16'
+  - key:             modernize-loop-convert.MinConfidence
+    value:           reasonable
+  - key:             modernize-loop-convert.NamingStyle
+    value:           CamelCase
+  - key:             modernize-pass-by-value.IncludeStyle
+    value:           llvm
+  - key:             modernize-replace-auto-ptr.IncludeStyle
+    value:           llvm
+  - key:             modernize-use-default-member-init.UseAssignment
+    value:           '1'
+  - key:             modernize-use-emplace.IgnoreImplicitConstructors
+    value:           '1'
+  - key:             modernize-use-nullptr.NullMacros
+    value:           'NULL'
+  - key:             readability-braces-around-statements.ShortStatementLines
+    value:           '2'
+...

lk.code-workspace

@@ -0,0 +1,14 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"editor.tabSize": 4,
+		"files.exclude": {
+			"**/.cache": true,
+			"**/.clangd": true
+		}
+	}
+}