Added readme, license and gitignore as solution items

Author: ArgusMagnus

FFTW.NET.sln

@@ -7,6 +7,13 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FFTW.NET", "FFTW.NET\FFTW.N
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestApp", "TestApp\TestApp.csproj", "{FF3AE58A-D8C5-4660-A253-6DFD46EEB8E6}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{C70D1EED-A6CF-48D4-A689-D21FE0A46AEB}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+		LICENSE = LICENSE
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU

README.md

@@ -26,5 +26,5 @@ There are three array classes which you can use to perform transformations:
 * FftwArray<T>: This class allocates unmanaged memory using fftw_malloc.
   This class was somewhat rendered obsolete by the introduction of AlignedArray<T>.
 
-If none of these fits your needs, you can always create your own by
+If none of these fit your needs, you can always create your own by
 implementing the IPinnedArray<T> interface.