Add validation tests for USF and enhance ATR indicator tests

- Introduced Usf.Validation.Tests.cs to validate the USF (Ehlers Ultimate Smoother Filter) for consistency across batch, streaming, and span modes, as well as mathematical properties and coefficient calculations.
- Added comprehensive tests for the ATR indicator in Atr.Quantower.Tests.cs, including constructor validation, historical data processing, and handling of NaN/Infinity inputs.
- Enhanced Atr.Tests.cs with additional tests for iterative corrections, warmup behavior, and true range calculations.
- Updated Atr.cs to ensure warmup period is derived from RMA.
- Added new tests for Adosc in Adosc.Tests.cs to validate handling of NaN and Infinity inputs, and to ensure batch calculations match iterative results.
- Created a new Volatility.csproj to organize volatility-related implementations.

quantower/Quantower.Tests.csproj

@@ -37,6 +37,8 @@
     <Compile Include="..\lib\volume\**\*.cs" Exclude="..\lib\volume\**\*.Tests.cs;..\lib\volume\**\*.Validation.Tests.cs;..\lib\volume\**\obj\**;..\lib\volume\**\bin\**" />
     <!-- Include statistics implementations -->
     <Compile Include="..\lib\statistics\**\*.cs" Exclude="..\lib\statistics\**\*.Tests.cs;..\lib\statistics\**\*.Validation.Tests.cs;..\lib\statistics\**\obj\**;..\lib\statistics\**\bin\**" />
+    <!-- Include volatility implementations -->
+    <Compile Include="..\lib\volatility\**\*.cs" Exclude="..\lib\volatility\**\*.Tests.cs;..\lib\volatility\**\*.Validation.Tests.cs;..\lib\volatility\**\obj\**;..\lib\volatility\**\bin\**" />
     <!-- Include IndicatorExtensions -->
     <Compile Include="IndicatorExtensions.cs" />
   </ItemGroup>

quantower/Volatility.csproj

@@ -0,0 +1,36 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks Condition="'$(Configuration)' == 'Release'">net10.0;net8.0</TargetFrameworks>
+    <TargetFramework Condition="'$(Configuration)' == 'Debug'">net10.0</TargetFramework>
+    <AssemblyName>Volatility</AssemblyName>
+    <AlgoType>Indicator</AlgoType>
+    <OutputPath>bin\$(Configuration)\</OutputPath>
+    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+    <IsPackable>false</IsPackable>
+    <SonarQubeExclude>true</SonarQubeExclude>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Drawing.Common" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="IndicatorExtensions.cs" />
+    <Compile Include="..\lib\core\**\*.cs" Exclude="..\lib\core\**\*.Tests.cs;..\lib\core\**\obj\**;..\lib\core\**\bin\**" />
+    <Compile Include="..\lib\volatility\**\*.cs" Exclude="..\lib\volatility\**\*.Tests.cs;..\lib\volatility\**\obj\**;..\lib\volatility\**\bin\**" />
+    <Compile Include="..\lib\trends\ema\*.cs" Exclude="..\lib\trends\ema\*.Tests.cs" />
+    <Compile Include="..\lib\trends\rma\*.cs" Exclude="..\lib\trends\rma\*.Tests.cs" />
+    <Reference Include="TradingPlatform.BusinessLayer">
+      <HintPath>..\.github\TradingPlatform.BusinessLayer.dll</HintPath>
+    </Reference>
+    <None Include="..\.github\TradingPlatform.BusinessLayer.xml">
+      <Link>TradingPlatform.BusinessLayer.xml</Link>
+    </None>
+  </ItemGroup>
+
+  <Target Name="CopyCustomContent" AfterTargets="AfterBuild" Condition="'$(IsLocalBuild)' == 'true' AND $([MSBuild]::IsOSPlatform('Windows'))">
+    <Copy SourceFiles="$(OutputPath)\Volatility.dll" DestinationFolder="$(QuantowerRoot)\Settings\Scripts\Indicators\QuanTAlib\Volatility" />
+  </Target>
+
+</Project>