Added base classes.

.gitignore

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+### DotnetCore ###
+# .NET Core build folders
+bin/
+obj/
+
+# Common node modules locations
+/node_modules
+/wwwroot/node_modules

Cipher.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PackageId>Crews.Web.Cipher</PackageId>
+    <Version>0.1.0</Version>
+    <Authors>Tommy Crews</Authors>
+    <Company>Crews Development</Company>
+  </PropertyGroup>
+
+</Project>

HtmlDocument.cs

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+namespace Crews.Web.Cipher;
+public class HtmlDocument
+{
+	public List<HtmlElement> Elements { get; set; } = new();
+}

HtmlElement.cs

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+namespace Crews.Web.Cipher;
+
+public abstract class HtmlElement
+{
+	private string _name;
+
+	public List<HtmlElement> Children = new();
+	public HtmlElement(string name) => _name = name;
+}