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/Imports/MemoryImport.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Diagnostics;
+
+namespace Wasmtime.Imports
+{
+    /// <summary>
+    /// Represents a memory imported to a WebAssembly module.
+    /// </summary>
+    public class MemoryImport : Import
+    {
+        internal MemoryImport(IntPtr importType, IntPtr externType) : base(importType)
+        {
+            Debug.Assert(Interop.wasm_externtype_kind(externType) == Interop.wasm_externkind_t.WASM_EXTERN_MEMORY);
+
+            var memoryType = Interop.wasm_externtype_as_memorytype_const(externType);
+
+            unsafe
+            {
+                var limits = Interop.wasm_memorytype_limits(memoryType);
+                Minimum = limits->min;
+                Maximum = limits->max;
+            }
+        }
+
+        /// <summary>
+        /// The minimum memory size (in WebAssembly page units).
+        /// </summary>
+        public uint Minimum { get; private set; }
+
+        /// <summary>
+        /// The maximum memory size (in WebAssembly page units).
+        /// </summary>
+        public uint Maximum { get; private set; }
+    }
+}