[SalesForce] How to write a trigger for EntitySubscription object

I have situation kind of user is following certain user when they press other user profile with like button. User object have a field called followerCount field which will hold number of followers for users.
when user click other user profile as follower i am calling Below @RemoteAction will create me relation between the users in entitySubscription object. Problem i am facing is when i create new record/relation on entitySubscription i wanted trigger a function so that , i want to calculate number followerCount for user.
but i don't know where to write trigger for entitySubscription ? how can i achieve this functionality? 

   @RemoteAction
        public static Boolean followUsers(String ParentIdStr) {

            Id ParentId = Id.valueOf(ParentIdStr);
            EntitySubscription entitySubscription = new EntitySubscription(SubscriberId = Userinfo.getUserID(),
                                                                           ParentId = ParentId,
                                                                           NetworkId = Network.getNetworkId());
            try {
                insert entitySubscription;
                return true;
            } 
            catch (DmlException e) {
                system.debug(e.getMessage());
                return false;
            }
        }

Best Answer

Currently, you can't create trigger on EntitySubscription standard object

Check this idea post https://success.salesforce.com/ideaView?id=08730000000l4s8AAA

Allow triggers on EntitySubscription standard object Apex & Visualforce

Please allow creation of an Apex trigger against the EntitySubscription object, this provides us with much greater control over who can follow who/what in chatter and is a must have feature!

So for your question

when i create new record/relation on entitySubscription i wanted trigger a function so that , i want to calculate number followerCount for user

You can place the followerCount for user logic in your remote function. After EntitySubscription insert just calculate the followerCount code

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