Table support for markdown editor#22

I write test description and want to describe infromation in structured was like a table. For example, if I have multiple steps and expected results for each step or test data as input

|        steps       | expected                         |
|:------------------:|----------------------------------|
| to do some step    | you should see something special |
| to do another step | you should see alert             |
| another step       | another expected result for it   |

or

| api | request | data         |
|-----|---------|--------------|
| v1  | create  | file object  |
| v1  | delete  | media object |

Also it’s handy to store information like these as it may be compatible with gherkin language.

Happy this feature is in progress. Is it also possible to include automatic column formatting/alignment to increase readability?

We have implemented rendering already. Auto-formatting / alignment is comming next.

new #39 is created.