style(editorconfig): add indent size (#8)

.editorconfig

@@ -8,3 +8,15 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.{json,jsonc,yml,yaml,sh,puml,md}]
+indent_size = 2
+
+[*.cs]
+indent_size = 4
+
+[*.sln]
+indent_style = tab
+
+[*.{pbxproj,plist,entitlements,xcsettings}]
+indent_style = tab