Add XML docs

YesNt.Interpreter/Enums/SpaceAround.cs

@@ -1,9 +1,19 @@
 namespace YesNt.Interpreter.Enums;
 
+/// <summary>
+/// Specifies which sides of a statement keyword must be surrounded by a space when matching.
+/// </summary>
 public enum SpaceAround
 {
+    /// <summary>A space is required both before and after the keyword.</summary>
     StartEnd,
+
+    /// <summary>A space is required before the keyword only.</summary>
     Start,
+
+    /// <summary>A space is required after the keyword only.</summary>
     End,
+
+    /// <summary>No surrounding spaces are required.</summary>
     None
 }