Add project files.

JSMR.Application/Common/Caching/CacheEntryOptions.cs

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+namespace JSMR.Application.Common.Caching;
+
+public class CacheEntryOptions
+{
+    private DateTimeOffset? _absoluteExpiration;
+    private TimeSpan? _absoluteExpirationRelativeToNow;
+    private TimeSpan? _slidingExpiration;
+
+    /// <summary>
+    /// Gets or sets an absolute expiration date for the cache entry.
+    /// </summary>
+    public DateTimeOffset? AbsoluteExpiration
+    {
+        get
+        {
+            return _absoluteExpiration;
+        }
+        set
+        {
+            _absoluteExpiration = value;
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets an absolute expiration time, relative to now.
+    /// </summary>
+    public TimeSpan? AbsoluteExpirationRelativeToNow
+    {
+        get
+        {
+            return _absoluteExpirationRelativeToNow;
+        }
+        set
+        {
+            if (value <= TimeSpan.Zero)
+            {
+                throw new ArgumentOutOfRangeException(
+                    nameof(AbsoluteExpirationRelativeToNow),
+                    value,
+                    "The relative expiration value must be positive.");
+            }
+
+            _absoluteExpirationRelativeToNow = value;
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets how long a cache entry can be inactive (e.g. not accessed) before it will be removed.
+    /// This will not extend the entry lifetime beyond the absolute expiration (if set).
+    /// </summary>
+    public TimeSpan? SlidingExpiration
+    {
+        get
+        {
+            return _slidingExpiration;
+        }
+        set
+        {
+            if (value <= TimeSpan.Zero)
+            {
+                throw new ArgumentOutOfRangeException(
+                    nameof(SlidingExpiration),
+                    value,
+                    "The sliding expiration value must be positive.");
+            }
+            _slidingExpiration = value;
+        }
+    }
+}