added clang format file and image_size

.clang-format

@@ -0,0 +1,18 @@
+---
+BasedOnStyle: Microsoft
+AlignAfterOpenBracket: Align
+AllowAllArgumentsOnNextLine: 'true'
+AllowAllParametersOfDeclarationOnNextLine: 'true'
+AllowShortIfStatementsOnASingleLine: Never
+BreakBeforeBraces: Allman
+IndentWidth: '4'
+Language: Cpp
+NamespaceIndentation: All
+SpacesInAngles: 'true'
+SpacesInCStyleCastParentheses: 'true'
+SpacesInContainerLiterals: 'true'
+SpacesInParentheses: 'true'
+SpacesInSquareBrackets: 'true'
+UseTab: Never
+
+...