Used Ajax to insert new Event without reloading page.

1)- used Ajax's XMLHttpRequest to call Controller,s POST().
2)- In EventController's Post method at this time we are not Fetching data Again.
3)- We Just inserting Data using POST() of Controller Class.
4)- And Fetching all Data only in get() method of Controller Class.

Signed-off-by: manojsa <sawantmanojm@gmail.com>