Readme update.

Author: sergey-shandar

experiments/Azure.Experiments/Azure.Experiments/readme.md

@@ -1,4 +1,4 @@
-# Stages
+## Stages
 
 1. Get a current Azure state. Each resource has a function to get information from Azure.
    The function is an asynchronous operation.
@@ -7,4 +7,48 @@
    All decisions has to be made on this stage.
 3. Create a graph of create/update operations. This operation is synchronous.
 4. Execute the graph. This operation is asynchronous and may require a progress bar, AsJob etc.
-   It can also create several resources simultaneously.
+   It can also create several resources simultaneously.
+
+## Policies
+
+```cs
+interface IInfoMap
+{
+    Info Get<Info>(IResourcePolicy<Info> info)
+        where Info : class;
+}
+interface IResourcePolicy
+{
+}
+interface IResourcePolicy<Info> : IResourcePolicy
+    where Info : class
+{
+    IEnumerable<IResourcePolicy> Dependencies { get; }
+    string GetLocation(Info info);
+    Task<Info> CreateAsync(Context context, Info info);
+}
+interface IResourcePolicy<Info, Id> : IResourcePolicy<Info>
+    where Info : class
+{
+    Task<Info> GetAsync(Context context, Id id);
+}
+sealed class ManagedResourceId
+{
+    string ResourceGroupName { get; }
+    string Name { get; }
+}
+interface IManagedResourcePolicy<Info> : IResource<Info, ManagedResourceId>
+{
+	ResourceGroupPolicy
+    void UpdateInfo(Info info, IInfoMap infoMap);
+}
+interface IResourceGroupPolicy : IResourcePolicy<ResourceGroup, string>
+{
+}
+interface ISubresource<Info, ParentInfo> : IResource
+{
+    IResource<ParentInfo> Parent { get; }
+    Info Get(ParentInfo parentInfo);
+    void Set(ParentInfo info, Info info);
+}
+```