add editorconfig and clang-format files

formatting-configs/.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = tab
+indent_size = 8
+tab_width = 8
+end_of_line = lf
+insert_final_newline = true
+
+[*.{c,cc,cpp,h,hpp}]
+
+# Unbraced single-statement blocks
+cpp_remove_braces_for_single_line_control_statements = true
+resharper_cpp_remove_braces_for_single_statements = true
+resharper_cpp_add_braces_for_single_line_if = false
+
+# Enforce BSD KNF for function bracess
+cpp_new_line_before_open_brace_function = new_line
+resharper_cpp_brace_style = next_line
+resharper_cpp_function_definition_braces = next_line
+
+# Enforce K&R for everything else
+cpp_new_line_before_open_brace_namespace = same_line
+cpp_new_line_before_open_brace_type = same_line
+cpp_new_line_before_open_brace_block = same_line
+cpp_new_line_before_open_brace_lambda = same_line
+cpp_new_line_before_else = false
+cpp_new_line_before_catch = false
+resharper_cpp_namespace_declaration_braces = end_of_line
+resharper_cpp_type_declaration_braces = end_of_line
+resharper_cpp_control_transfer_braces = end_of_line

formatting-configs/clang-format.json

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+{
+    "BasedOnStyle": "LLVM",
+    "UseTab": "Always",
+    "IndentWidth": 8,
+    "TabWidth": 8,
+    "LineEnding": "LF",
+    "RemoveBracesLLVM": true,
+    "AlwaysBreakAfterReturnType": "AllDefinitions",
+    "BreakBeforeBraces": "Custom",
+    "BraceWrapping": {
+	"AfterFunction": true,
+	"AfterClass": false,
+	"AfterControlStatement": false,
+	"AfterNamespace": false,
+	"AfterStruct": false,
+	"BeforeElse": false,
+	"BeforeCatch": false
+    }
+}

formatting-configs/clang-format.yml

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+# BSD KNF funcs + K&R blocks + other stuff
+# Requires clang-format >=16
+BasedOnStyle: LLVM # defaults
+UseTab: Always
+IndentWidth: 8
+TabWidth: 8
+LineEnding: LF # unix
+
+RemoveBracesLLVM: true # single-statement blocks
+AlwaysBreakAfterReturnType: AllDefinitions # KNF functions
+
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterFunction: true # KNF
+  AfterClass: false # K&R
+  AfterControlStatement: false # K&R
+  AfterNamespace: false # K&R
+  AfterStruct: false # K&R
+  BeforeElse: false # K&R
+  BeforeCatch: false # K&R