initial implementation of #150, minus adjustments to CONTRIBUTING.md

- drop dead code within `CMakeLists.txt`
- remove old `.github/workflows/.clang-format`
- create new `.clang-format` at the repository root, with settings based on observed patterns & `CONTRIBUTING.md`

.clang-format

@@ -0,0 +1,41 @@
+Language: Cpp
+AccessModifierOffset: 0
+AlignConsecutiveMacros: true
+BreakBeforeBraces: Linux
+IndentWidth: 2
+ConstructorInitializerIndentWidth: 2
+AlignAfterOpenBracket: Align
+Standard: c++11
+IndentAccessModifiers: true
+IndentCaseBlocks: true
+IndentCaseLabels: true
+IndentGotoLabels: true
+IndentExternBlock: Indent
+UseTab: Never
+ReflowComments: true
+QualifierAlignment: Left
+ReferenceAlignment: Pointer
+PointerAlignment: Left
+InsertBraces: true
+NamespaceIndentation: All
+LineEnding: LF
+IntegerLiteralSeparator:
+    Binary: 4
+    BinaryMinDigits: 8
+    Decimal: 3
+    DecimalMinDigits: 4
+    Hex: 2
+    HexMinDigits: 6
+BreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+AllowShortFunctionsOnASingleLine: None
+AllowAllArgumentsOnNextLine: false
+IncludeBlocks: Regroup
+IncludeCategories:
+    - Regex: '^<resolve/'
+      Priority: 1
+    - Regex: '^<[[:alnum:].]+>'
+      Priority: -1
+    - Regex: '.*'
+      Priority: 0

CMakeLists.txt

@@ -53,10 +53,6 @@ set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/lib)
 # Add CMake sources from `cmake` dir
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
-# Including clang-format cmake files to do automatic checking of formating
-# TODO: Set up clang-format
-#include(./cmake/clang-format)
-
 # This will create target `doxygen` for building documentation locally.
 # For now, this target is intended only for developers who want to test
 # different documentation configurations. To have Doxygen configuration
@@ -153,7 +149,7 @@ configure_package_config_file(./cmake/ReSolveConfig.cmake.in
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ReSolveConfig.cmake"
         "${CMAKE_CURRENT_BINARY_DIR}/ReSolveConfigVersion.cmake"
         DESTINATION share/resolve/cmake)
-    
+
 # Add usage examples
 add_subdirectory(examples)