Add project files.

src/common/Elsa.Api.Common/Models/CountResponse.cs

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+namespace Elsa.Models;
+
+/// <summary>
+/// Represents a count response that offers a unified format for returning count of things from API endpoints.
+/// </summary>
+/// <param name="Count">The number of items found for a given query.</param>
+public record CountResponse(long Count);

src/common/Elsa.Api.Common/Models/LinkedResource.cs

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+namespace Elsa.Models;
+
+public record LinkedResource(Link[] Links)
+{
+    public LinkedResource() : this([]) { }
+}
+
+public record Link(string Href, string Rel, string Method);

src/common/Elsa.Api.Common/Models/ListResponse.cs

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+namespace Elsa.Models;
+
+/// <summary>
+/// Represents a generic list response that offers a unified format for returning list of things from API endpoints.
+/// </summary>
+public class ListResponse<T>
+{
+    /// <summary>
+    /// Default constructor.
+    /// </summary>
+    public ListResponse()
+    {
+    }
+    
+    /// <summary>
+    /// Constructor accepting a list of items.
+    /// </summary>
+    public ListResponse(ICollection<T> items)
+    {
+        Items = items;
+        Count = items.Count;
+    }
+
+    /// <summary>
+    /// A list of items.
+    /// </summary>
+    public ICollection<T> Items { get; set; } = default!;
+    
+    /// <summary>
+    /// The number of items in the list. 
+    /// </summary>
+    public long Count { get; set; }
+}

src/common/Elsa.Api.Common/Models/PagedListResponse.cs

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+using Elsa.Common.Models;
+
+namespace Elsa.Models;
+
+public record PagedListResponse<T>: LinkedResource
+{
+    public PagedListResponse()
+    {
+    }
+    
+    public PagedListResponse(Page<T> page)
+    {
+        Items = page.Items;
+        TotalCount = page.TotalCount;
+    }
+
+    public ICollection<T> Items { get; set; } = default!;
+    public long TotalCount { get; set; }
+    
+    public static PagedListResponse<T> From(Page<T> page) => new(page);
+}

src/common/Elsa.Api.Common/Models/ValidateCredentialsResult.cs

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+namespace Elsa.Models;
+
+public record ValidateCredentialsResult(bool IsValid, object? Context = null)
+{
+    public static ValidateCredentialsResult Invalid() => new(false);
+    public static ValidateCredentialsResult Valid(object? context = null) => new(true, context);
+}