ViIvanov/Collection-to-index.cs

## Collection-to-index.cs
// Before
var dictionary1 = new Dictionary<int, string> {
  { 1, "One" },
  { 2, "Two" },
};

// After
var dictionary2 = new Dictionary<int, string> {
  [1] = "One",
  [2] = "Two",
};
	// Before
	var dictionary1 = new Dictionary<int, string> {
	{ 1, "One" },
	{ 2, "Two" },
	};

	// After
	var dictionary2 = new Dictionary<int, string> {
	[1] = "One",
	[2] = "Two",
	};