Add unit test for gettext parser.

Claunia.Localization.Test/Claunia.Localization.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp2.2</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="nunit" Version="3.11.0" />
+        <PackageReference Include="NUnit3TestAdapter" Version="3.11.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <None Update="gettext\es_ES.po">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Claunia.Localization.Parsers\Claunia.Localization.Parsers.csproj" />
+    </ItemGroup>
+
+</Project>

Claunia.Localization.Test/gettext/Test.cs

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+using System.IO;
+using System.Text;
+using NUnit.Framework;
+
+namespace Claunia.Localization.Test.gettext
+{
+    [TestFixture]
+    public sealed class Test
+    {
+        [Test]
+        public void Parse()
+        {
+            var testPath = Path.Combine(".", "gettext","es_ES.po");
+
+            var localization = Claunia.Localization.Parsers.GetText.Parse(testPath, Encoding.GetEncoding("iso8859-1"));
+        }
+    }
+}