[FEAT] Update indent settings and add a clang-format file

.clang-format

@@ -0,0 +1,32 @@
+---
+# We'll use defaults from the LLVM style, but with 4 columns indentation.
+BasedOnStyle: LLVM
+IndentWidth: 4
+# use \n instead of \r\n
+UseCRLF: true
+# spaces, not tabs!
+UseTab: Never
+---
+Language: Cpp
+Standard: c++17
+AccessModifierOffset: -4
+# Force pointers to the type for C++.
+DerivePointerAlignment: false
+PointerAlignment: Left
+# Use 100 columns
+ColumnLimit: 100
+AlignConsecutiveStyle: Consecutive
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: Never
+AlwaysBreakAfterReturnType: None
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+SplitEmptyFunction: true
+BreakBeforeBraces: Allman
+SeparateDefinitionBlocks: Always
+NamespaceIndentation: All
+IndentAccessModifiers: false
+ReferenceAlignment: Right
+BreakConstructorInitializers: AfterColon
+...