- add clang-format settings

.clang-format

@@ -0,0 +1,69 @@
+# Formatting rules for rtphone's own C++ sources (src/engine, src/libs/ice, test).
+# Third-party code under src/libs/ is excluded via .clang-format-ignore.
+---
+Language:        Cpp
+BasedOnStyle:    LLVM
+Standard:        c++20
+
+# Indentation: 4 columns, spaces only.
+IndentWidth:     4
+TabWidth:        4
+UseTab:          Never
+AccessModifierOffset: -4
+NamespaceIndentation: None
+IndentCaseLabels: false
+
+ColumnLimit:     120
+
+# Allman braces, as used throughout the codebase.
+BreakBeforeBraces: Allman
+
+PointerAlignment: Left
+ReferenceAlignment: Left
+DerivePointerAlignment: false
+
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortBlocksOnASingleLine: Empty
+
+# Include order matters here (platform headers, windows.h, vendored libs),
+# so never reorder them.
+SortIncludes:    Never
+IndentPPDirectives: None
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 2
+FixNamespaceComments: true
+SpaceAfterTemplateKeyword: false
+AlwaysBreakTemplateDeclarations: Yes
+AlignConsecutiveDeclarations: AcrossEmptyLinesAndComments
+
+# Objective-C++ (src/libs/ice/ICEIosSupport.mm) — same rules as C++.
+---
+Language:        ObjC
+BasedOnStyle:    LLVM
+IndentWidth:     4
+TabWidth:        4
+UseTab:          Never
+AccessModifierOffset: -4
+NamespaceIndentation: None
+IndentCaseLabels: false
+ColumnLimit:     120
+BreakBeforeBraces: Allman
+PointerAlignment: Left
+ReferenceAlignment: Left
+DerivePointerAlignment: false
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortBlocksOnASingleLine: Empty
+SortIncludes:    Never
+IndentPPDirectives: None
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 2
+FixNamespaceComments: true
+AlignConsecutiveDeclarations: AcrossEmptyLinesAndComments
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true

.clang-format-ignore

@@ -0,0 +1,2 @@
+src/libs/**
+!src/libs/ice/ICE*