Update readme and license

LICENSE.txt

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-The MIT License (MIT)
-
 Copyright (c) 2016 Charlie Poole
 
 Permission is hereby granted, free of charge, to any person obtaining a copy

README.md

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 # NUnit.System.Linq
 Partial implementation of System.Linq for use with NUnit's .NET 2.0 framework builds and by the TestEngine.
+
+This assembly contains classes in the System.Linq namespace as well as other classes not present in .NET 2.0 but needed in order to support System.Linq. It will cause conflicts if referenced by an assembly that targets a runtime other than .NET 2.0.
+
+## System.Linq Types Supported
+
+ * `Check`
+ * `Enumerable`
+ * `Grouping<K, T>`
+ * `IGrouping<TKey, TElement>`
+ * `ILookup<TKey, TElement>`
+ * `IOrderedEnumerable<TElement>`
+ * `Lookup<TKey, TElement>`
+ * `OrderedEnumerable<TElement>`
+ * `OrderedSequence<TElement, TKey>`
+ * `QuickSort<TElement>`
+ * `SortContext<TElement>`
+ * `SortDirection
+ * `SortSequenceContext<TElement, TKey>`
+
+## Other Types Included
+
+#### System
+
+ * `Action`
+ * `Action<T1, T2>`
+ * `Action<T1, T2, T3>`
+ * `Action<T1, T2, T3, T4>`
+ * `Func<TResult>`
+ * `Func<T, TResult>`
+ * `Func<T1, T2, TResult>`
+ * `Func<T1, T2, T3, TResult>`
+ * `Func<T1, T2, T3, T4, TResult>`
+
+#### System.Collections
+
+ * `HashPrimeNumbers`
+
+#### System.Collections.Generic
+
+ * `CollectionDebuggerView<T, U>`
+ * `CollectionDebuggerView<T>`
+ * `HashSet<T>`
+ * `HashSet<T>.Enumerator`
+ * `HashSetEqualityComparer<T>`
+
+#### System.Runtime.CompilerServices
+
+ * `ExtensionAttribute`