Add API to count items in collection.
Add API to count items in collection.

MNBuyskih/adsbypasser,tablesmit/adsbypasser,kehugter/adsbypasser,tosunkaya/adsbypasser,tablesmit/adsbypasser,xor10/adsbypasser,kehugter/adsbypasser,tosunkaya/adsbypasser,MNBuyskih/adsbypasser,tablesmit/adsbypasser,tosunkaya/adsbypasser,xor10/adsbypasser,MNBuyskih/adsbypasser,xor10/adsbypasser,kehugter/adsbypasser