ENH: Add index option to_markdown()

[quangngd]

• closes Add index=False option to_markdown()  #32667
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[jreback]

looks good. can you add a release note in other enhancements for 1.1 ping on green.

[quangngd]

@jreback apparently, the pytest.warns in my test is an unwanted pattern. Should i remove that part of code and ignore the testcase when index and showindex is both set?

[simonjayhawkins]

@quangngd can you merge master.

[jreback]

@quangngd can you update as @TomAugspurger suggests (will need to change the test as well)

[quangngd]

How tests should handle warnings?

[alimcmaster1]

How tests should handle warnings?

Sure! There is a note on the contributing guide here: https://pandas.pydata.org/docs/dev/development/contributing.html#testing-warnings

Can you merge master + get a green CI?

[quangngd]

@alimcmaster1 i don't know what to do with the codecov/patch fail

[simonjayhawkins]

Thanks @quangngd for working on this. can you update the parameters section of the docstring.

[simonjayhawkins]

Thanks @quangngd generally lgtm. @jreback

[simonjayhawkins]

@quangngd still need to update the docstring #33091 (review)

[jreback]

small comment, pls merge master and ping on green.

[jreback]

can you merge master and address comments

[jreback]

thanks @quangngd