Initial C# SDK structure and interfaces

Interfaces/IDatabaseAPI.cs

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+namespace Chtn.CSharpSDK.Interfaces
+{
+    public interface IDatabaseAPI
+    {
+        void Set(string collection, string key, object value);
+        string Get(string collection, string key);
+        void Delete(string collection, string key);
+        void Flush();
+    }
+}

Interfaces/IKeyringAPI.cs

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+namespace Chtn.CSharpSDK.Interfaces
+{
+    public interface IKeyringAPI
+    {
+        void Set(string key, object value);
+        string Get(string key);
+        void Delete(string key);
+        void Flush();
+    }
+}