Add project files.

src/modules/Elsa.Alterations.Core/Contracts/IAlterationSerializer.cs

@@ -0,0 +1,27 @@
+namespace Elsa.Alterations.Core.Contracts;
+
+/// <summary>
+/// Serializes and deserializes <see cref="IAlteration"/> objects.
+/// </summary>
+public interface IAlterationSerializer
+{
+    /// <summary>
+    /// Serializes the specified <see cref="IAlteration"/> object.
+    /// </summary>
+    string Serialize(IAlteration alteration);
+
+    /// <summary>
+    /// Serializes the specified set of <see cref="IAlteration"/> objects.
+    /// </summary>
+    string SerializeMany(IEnumerable<IAlteration> alterations);
+    
+    /// <summary>
+    /// Deserializes the specified JSON string into an <see cref="IAlteration"/> object.
+    /// </summary>
+    IAlteration Deserialize(string json);
+    
+    /// <summary>
+    /// Deserializes the specified JSON string into a set of <see cref="IAlteration"/> objects.
+    /// </summary>
+    IEnumerable<IAlteration> DeserializeMany(string json);
+}