Update README

README

@@ -1 +1,22 @@
-Hello World!
+AutoRefreshingCache is implemeted in C#. It provides a MemoryCache which tries to refresh hot values before 
+actual expiration time is reached. It gives you a single public method (i.e. GET).
+Here comes the pseudocode of this cache.
+
+
+get(param)
+	res = cache.get(param)
+	if (res == null)
+		refresh(param, null)
+		return cache.get(param)
+	if (res needs to be refresh)
+		res.refreshWorkers.increment
+		if (res.refreshWorkers == 1)
+			task.run(() => refresh(param, res.refreshWorkers))
+	return res.data
+
+
+refresh(param, refreshWorkers)
+	data = calc(param)
+	cache.put(key:param, value:{data, now}, expiration:exp_time)
+	if (refreshWorkers != null)
+		refreshWorkers.decrement