add .editorconfig

.csharpierrc

@@ -1,3 +0,0 @@
-{
-  "printWidth": 120
-}

.editorconfig

@@ -0,0 +1,33 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+max_line_length = 120
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+csharp_style_namespace_declarations = file_scoped:warning
+csharp_space_after_cast = true
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_place_attribute_on_same_line = false
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.{cs,vb}]
+dotnet_naming_rule.private_members_with_underscore.symbols = private_fields
+dotnet_naming_rule.private_members_with_underscore.style = prefix_underscore
+dotnet_naming_rule.private_members_with_underscore.severity = suggestion
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+
+dotnet_naming_style.prefix_underscore.capitalization = camel_case
+dotnet_naming_style.prefix_underscore.required_prefix = _

DotNetSolutionTools.sln

@@ -8,10 +8,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SolutionParityChecker.App",
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{4B49F43F-2B01-487B-9831-6CF51AE4A977}"
 	ProjectSection(SolutionItems) = preProject
-		.csharpierrc = .csharpierrc
 		.gitignore = .gitignore
 		global.json = global.json
 		README.md = README.md
+		.editorconfig = .editorconfig
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".github", ".github", "{B38F2F03-5210-49A3-B6D2-3F9A7ED163CF}"

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.100",
+    "version": "9.0.300",
     "rollForward": "latestFeature",
     "allowPrerelease": false
   }