Update cpp/.clang-format, cpp/README.md files

cpp/.clang-format

+---
+# Last Update: 2019-08-17T01:33:00
+Language: Cpp
+AccessModifierOffset: '-2'
+AlignAfterOpenBracket: 'AlwaysBreak'
+AlignConsecutiveAssignments : 'true'
+AlignConsecutiveDeclarations: 'true'
+AllowShortBlocksOnASingleLine: 'false'
+AllowShortFunctionsOnASingleLine: 'None'
+AlwaysBreakTemplateDeclarations: 'true'
+BinPackArguments: 'false'
+BinPackParameters: 'false'
+BreakBeforeBraces: 'Custom'
+BreakBeforeTernaryOperators: 'true'
+BreakConstructorInitializers: 'BeforeComma'
+ColumnLimit: '80'
+CompactNamespaces: 'true'
+DerivePointerAlignment: 'false'
+FixNamespaceComments: 'true'
+IncludeBlocks: Regroup
+IndentPPDirectives: AfterHash
+IndentWidth: '2'
+NamespaceIndentation: 'None'
+PointerAlignment: 'Right'
+ReflowComments: 'true'
+SpaceBeforeAssignmentOperators: 'true'
+SpacesInParentheses: 'true'
+TabWidth: '2'
+UseTab: Never
+
+BraceWrapping: {
+  AfterClass: 'true',
+  AfterControlStatement: 'true',
+  AfterEnum: 'true',
+  AfterFunction: 'true',
+  AfterNamespace: 'false',
+  AfterStruct: 'true',
+  AfterUnion: 'true',
+  AfterExternBlock: 'true',
+  BeforeCatch: 'true',
+  BeforeElse: 'true',
+}
+...

cpp/README.md

+# C/C++ style guide
+
+## Contents
+
+* `.clang-format`: 
\ No newline at end of file