Programming exercise #12 Count, how many certain items exists in array of objects.

	// So, you have input data like this
	let objArr = [
	{ id: 1, name: 'Kamil' },
	{ id: 2, name: 'Janusz' },
	{ id: 3, name: 'Mariusz' },
	{ id: 4, name: 'Alina' },
	{ id: 5, name: 'Olo' } ];
	// Please count, how many names in your array contains letter 'm'.
	// I suggest you, to use RXJS.

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