add: project members api and update forks api

app/controllers/projects/members_controller.rb

@@ -0,0 +1,6 @@
+class Projects::MembersController < Projects::BaseController
+  def index 
+    users = @project.all_collaborators.like(params[:search]).includes(:user_extension)
+    @users = kaminari_paginate(users)
+  end
+end

app/views/projects/members/index.json.jbuilder

@@ -0,0 +1,4 @@
+json.total_count @users.total_count
+json.users do
+  json.partial! 'users/user_small', users: @users
+end