Add clang-format file

People should run `make format` before doing a commit.
Fix https://github.com/profanity-im/profanity/issues/1396

.clang-format

@@ -0,0 +1,33 @@
+Language: Cpp
+BasedOnStyle: GNU
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeParens: ControlStatements
+ColumnLimit: 0
+PointerAlignment: Left
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: true
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowShortBlocksOnASingleLine: true
+IndentWidth: 4
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterControlStatement: Never
+  AfterFunction: true
+  BeforeElse: false
+  #BeforeWhile: false
+  AfterStruct: true
+#BreakStringLiterals: true