[#1] Add presentation layer

Signed-off-by: Ivan Pchelintsev <i.pchelintsev@yadro.com>

sdk/src/FrostFS.SDK.ModelsV2/ObjectId.cs

@@ -0,0 +1,32 @@
+using FrostFS.SDK.Cryptography;
+
+namespace FrostFS.SDK.ModelsV2;
+
+public class ObjectId
+{
+    public string Value { get; }
+
+    public ObjectId(string id)
+    {
+        Value = id;
+    }
+    
+    public static ObjectId FromHash(byte[] hash)
+    {
+        if (hash.Length != Helper.Sha256HashLength)
+        {
+            throw new FormatException("ObjectID must be a sha256 hash.");
+        }
+        return new ObjectId(Base58.Encode(hash));
+    }
+    
+    public byte[] ToHash()
+    {
+        return Base58.Decode(Value);
+    }
+
+    public override string ToString()
+    {
+        return Value;
+    }
+}