add codestyle guide

.clang-format

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+---
+AccessModifierOffset: '-2'
+AlignAfterOpenBracket: DontAlign
+AlignConsecutiveAssignments: 'false'
+AlignConsecutiveDeclarations: 'false'
+AlignOperands: 'false'
+AlignTrailingComments: 'false'
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortFunctionsOnASingleLine: 'true'
+AllowShortIfStatementsOnASingleLine: 'true'
+AllowShortLoopsOnASingleLine: 'false'
+BinPackArguments: 'true'
+BinPackParameters: 'true'
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: 'true'
+ColumnLimit: '0'
+ContinuationIndentWidth: '2'
+Cpp11BracedListStyle: 'true'
+DerivePointerAlignment: 'false'
+IndentCaseLabels: 'true'
+IndentWidth: '2'
+IndentWrappedFunctionNames: 'true'
+KeepEmptyLinesAtTheStartOfBlocks: 'false'
+Language: Cpp
+MaxEmptyLinesToKeep: '1'
+NamespaceIndentation: All
+PointerAlignment: Left
+SortIncludes: 'true'
+SpaceAfterCStyleCast: 'false'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: 'false'
+SpacesBeforeTrailingComments: '1'
+SpacesInAngles: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInParentheses: 'false'
+SpacesInSquareBrackets: 'false'
+Standard: Cpp11
+TabWidth: '2'
+UseTab: Always

README_codestyle.md

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+# libsuperderpy codestyle
+
+## clang-format
+
+See [the configuration file](.clang-format).
+
+## clang-tidy
+
+```
+-checks=*,-clang-analyzer-alpha.*,-google-readability-todo,-performance-type-promotion-in-math-fn,
+-misc-unused-parameters,-cert-msc30-c,-cert-msc50-cpp
+```
+
+*Note:* clang-tidy runs automatically during compilation if found by CMake (can be disabled with `-DUSE_CLANG_TIDY=no`)
+
+## Qt Creator's Code Model
+
+```
+-Weverything -Wno-missing-field-initializers -Wno-unused-parameter -Wno-padded -Wno-conversion
+-Wno-double-promotion -Wno-bad-function-cast -Wno-pedantic -Wno-unused-macros -std=c11 -D__codemodel__
+```