Added Artemis_UnitTests.csproj into ArtemisEntitySystemPcVS2012.sln

Added UnitTests project into PcVS2012 solution.
At least to conform with the Readme and PcVS2010 solution:
"Use ArtemisEntitySystemPcVS2012 to develop on Entity System and
Unit-tests only."

ArtemisEntitySystemPcVS2012.sln

@@ -3,14 +3,38 @@ Microsoft Visual Studio Solution File, Format Version 13.00
 # Visual Studio 2012
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Artemis", "Artemis_XNA_INDEPENDENT\Artemis.csproj", "{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Artemis_UnitTests", "Artemis_UnitTests\Artemis_UnitTests.csproj", "{7E590B36-02CD-415A-B920-69E6D96300C8}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|Mixed Platforms = Debug|Mixed Platforms
 		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|Mixed Platforms = Release|Mixed Platforms
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
 		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Release|Mixed Platforms.Build.0 = Release|Any CPU
 		{22C89AF2-E1CF-4976-91B9-7D33773DC6E7}.Release|x86.ActiveCfg = Release|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Release|Mixed Platforms.Build.0 = Release|Any CPU
+		{7E590B36-02CD-415A-B920-69E6D96300C8}.Release|x86.ActiveCfg = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE