67. create your own Promise

Promise is widely used nowadays, hard to think how we handled Callback Hell in the old times.

Can you implement a MyPromise Class by yourself?

At least it should match following requirements

1. new promise: new MyPromise((resolve, reject) => {})
2. chaining : MyPromise.prototype.then() then handlers should be called asynchronously
3. rejection handler: MyPromise.prototype.catch()
4. static methods: MyPromise.resolve(), MyPromise.reject().

This is a challenging problem. Recommend you read about Promise thoroughly first.