Init Scripts in new repo

Functional/Cache.cs

@@ -0,0 +1,17 @@
+namespace SJK.Functional;
+
+public class Cache<T> where T : class
+{
+    private T? _cache;
+    private Func<T> _provider;
+    private readonly Func<T, bool>? _isvalid;
+
+    public Cache(Func<T> provider, Func<T, bool>? isvalid = null)
+    {
+        _provider = provider;
+        _isvalid = isvalid;
+    }
+    public bool IsCached() => _cache is not null;
+    public T Value => _cache is null || (_isvalid is not null && !_isvalid(_cache)) ? _cache = _provider() : _cache;
+
+}