Move Wasmtime for .NET to the Wasmtime repo.

This moves the Wasmtime for .NET implementation to the Wasmtime repo.

Wasmtime for .NET is a binding of the Wasmtime API for use in .NET.

crates/misc/dotnet/src/ValueKind.cs

@@ -0,0 +1,35 @@
+using System;
+
+namespace Wasmtime
+{
+    /// <summary>
+    /// Represents the possible kinds of WebAssembly values.
+    /// </summary>
+    public enum ValueKind
+    {
+        /// <summary>
+        /// The value is a 32-bit integer.
+        /// </summary>
+        Int32,
+        /// <summary>
+        /// The value is a 64-bit integer.
+        /// </summary>
+        Int64,
+        /// <summary>
+        /// The value is a 32-bit floating point number.
+        /// </summary>
+        Float32,
+        /// <summary>
+        /// The value is a 64-bit floating point number.
+        /// </summary>
+        Float64,
+        /// <summary>
+        /// The value is a reference.
+        /// </summary>
+        AnyRef = 128,
+        /// <summary>
+        /// The value is a function reference.
+        /// </summary>
+        FuncRef,
+    }
+}