Created FileList with ability to set used files

HaDocumentNew/Interfaces/IDocument.cs

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+namespace HaDocument.Interfaces;
+
+public interface IDocument {
+
+}

HaDocumentNew/Interfaces/IHaDocumentOptions.cs

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+namespace HaDocument.Interfaces;
+
+public interface IHaDocumentOptions {
+    string HamannXMLFilePath { get; set; }
+    string[] AvailableVolumes { get; set; }
+    bool NormalizeWhitespace { get; set; }
+    (int, int) AvailableYearRange { get; set; }
+}

HaDocumentNew/Interfaces/ILibrary.cs

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+namespace HaDocument.Interfaces; 
+using System;
+using System.Collections.Immutable;
+using HaDocument.Models;
+using System.Linq;
+
+public interface ILibrary {
+    IHaDocumentOptions Options { get; }
+    ImmutableDictionary<string, Tradition> Traditions { get; }
+    ImmutableDictionary<string, Person> Persons { get; }
+    ImmutableDictionary<string, Meta> Metas { get; }
+    ImmutableDictionary<string, Marginal> Marginals { get; }
+    ImmutableDictionary<string, Location> Locations { get; }
+    ImmutableDictionary<string, Letter> Letters { get; }
+    ImmutableDictionary<string, Person> HandPersons { get; }
+    ImmutableDictionary<string, Editreason> Editreasons { get; }
+    ImmutableDictionary<string, Comment> Comments { get; }
+    ImmutableDictionary<string, ImmutableList<Backlink>> Backlinks { get; }
+    ImmutableDictionary<string, ImmutableList<Hand>> Hands { get; }
+    ImmutableDictionary<string, ImmutableDictionary<string, ImmutableDictionary<string, string>>> Structure { get; }
+    
+    ImmutableDictionary<string, Lookup<string, Comment>> CommentsByCategoryLetter { get; }
+    Lookup<string, Comment> CommentsByCategory { get; }
+    Lookup<string, Marginal> MarginalsByLetter { get; }
+    Lookup<string, Editreason> EditreasonsByLetter { get; }
+    ImmutableSortedSet<Meta> MetasByDate { get; }
+    ILookup<string, Meta> MetasByYear { get; }
+    ImmutableDictionary<string, Comment> SubCommentsByID { get; }
+}