Create README.md

README.md

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+# InterfaceGenerator [![NuGet Version](http://img.shields.io/nuget/v/InterfaceGenerator.svg?style=flat)](https://www.nuget.org/packages/InterfaceGenerator/)
+
+A simple source generator that creates interfaces by implementation. 
+
+Example user implementation:
+```cs
+[GenerateAutoInterface]
+public class SampleService : ISampleService
+{
+    public double Multiply(double x, double y)
+    {
+        return x * y;            
+    }
+
+    public int NiceNumber => 69;
+}
+```
+
+Auto generated interface:
+```cs
+public partial interface ISampleService
+{
+    double Multiply(double x, double y);
+    int NiceNumber { get; }
+}
+```
+
+<br>
+
+Supports:
+ - Methods, properties, indexers.
+ - Default arguments, `params` arguments.
+ - Generic types and methods.
+ - XML docs.
+ - Explicit interface names (using the `Name` property on `GenerateAutoInterface`.
+ - Explicit interface visibility (using the `VisibilityModifier` property on `GenerateAutoInterface`.
+ - Explicitly excluding a member from the interface (using `[AutoInterfaceIgnore]`).
+ 
+Missing:
+ - Events.
+ - Nested types.
+ - Probably a bunch of edge cases I forgot about.
+