Highlighted code blocks inside the app (#1153)

app/MindWork AI Studio/Tools/CodeHighlighting/CodeStringRule.cs

@@ -0,0 +1,14 @@
+namespace AIStudio.Tools.CodeHighlighting;
+
+/// <summary>
+/// How a language writes one kind of string, such as one in double quotation marks.
+/// </summary>
+/// <param name="Open">What opens the string, for example a quotation mark or three of them.</param>
+/// <param name="Close">What closes it.</param>
+/// <param name="Escape">The character which makes the next one a part of the string, even when it would
+/// close the string, or null when the string knows no escapes.</param>
+/// <param name="IsMultiline">Whether the string may run over several lines. Otherwise, it ends with its
+/// line, closed or not.</param>
+/// <param name="DoubledCloseIsLiteral">Whether the closing mark written twice stands for itself, as two
+/// apostrophes do within a string of SQL.</param>
+public sealed record CodeStringRule(string Open, string Close, char? Escape = '\\', bool IsMultiline = false, bool DoubledCloseIsLiteral = false);