Add .clang-format file

This tries to capture the "OpenVPN" format as
good as possible.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>

.clang-format

@@ -0,0 +1,44 @@
+---
+BasedOnStyle: Mozilla
+AccessModifierOffset: '-4'
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros:
+  Enabled: true
+  AcrossEmptyLines: true
+  AcrossComments: true
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments:
+  Kind: Always
+  OverEmptyLines: 1
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeBraces: Allman
+BreakBeforeTernaryOperators: true
+BreakStringLiterals: false
+ColumnLimit: '100'
+ContinuationIndentWidth: '4'
+DerivePointerAlignment: false
+IndentCaseLabels: true
+IndentGotoLabels: false
+IndentWidth: '4'
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+MaxEmptyLinesToKeep: '2'
+PointerAlignment: Right
+ReflowComments: true
+SortIncludes: false
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpacesBeforeTrailingComments: '2'
+SpacesInParens: Never
+TabWidth: '4'
+UseTab: Never