Add asmdef

Some classes made public
See #3

Author: muckSponge

UnityAsync/Assets/Plugins/Editor/.gitignore

@@ -5,7 +5,7 @@
 
 namespace UnityAsync.Awaiters
 {
-	struct IEnumeratorAwaiter : INotifyCompletion
+	public struct IEnumeratorAwaiter : INotifyCompletion
 	{
 		static readonly SendOrPostCallback postCallback = state => ((Action)state)();
 

UnityAsync/Assets/Plugins/Editor/JetBrains.meta

@@ -4,7 +4,7 @@
 
 namespace UnityAsync.Awaiters
 {
-	struct SynchronizationContextAwaiter : INotifyCompletion
+	public struct SynchronizationContextAwaiter : INotifyCompletion
 	{
 		static readonly SendOrPostCallback postCallback = state => ((Action)state)();
 

UnityAsync/Assets/UnityAsync/Awaiters/IEnumeratorAwaiter.cs

@@ -6,7 +6,7 @@
 
 namespace UnityAsync.Awaiters
 {
-	struct YieldInstructionAwaiter : INotifyCompletion
+	public struct YieldInstructionAwaiter : INotifyCompletion
 	{
 		static readonly SendOrPostCallback postCallback = state => ((Action)state)();
 

UnityAsync/Assets/UnityAsync/Awaiters/SynchronizationContextAwaiter.cs

@@ -9,7 +9,7 @@
 
 namespace UnityAsync
 {
-	static class Extensions
+	public static class Extensions
 	{
 		static readonly Func<Object, IntPtr> ObjectPtrGetter;
 
@@ -19,7 +19,7 @@ static Extensions()
 		}
 
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
-		public static bool IsAlive(this Object o) => ObjectPtrGetter(o) != IntPtr.Zero;
+		internal static bool IsAlive(this Object o) => ObjectPtrGetter(o) != IntPtr.Zero;
 
 		/// <summary>
 		/// Link the <see cref="UnityAsync.IAwaitInstruction"/>'s lifespan to a <see cref="UnityEngine.Object"/> and

UnityAsync/Assets/UnityAsync/Awaiters/YieldInstructionAwaiter.cs

@@ -5,7 +5,7 @@
 
 namespace UnityAsync
 {
-	public static class ReflectionUtility
+	internal static class ReflectionUtility
 	{
 		public static void GenerateFieldGetter<TTarget, TField>(string field, out Func<TTarget, TField> getter)
 		{