Add README.md

[yarikoptic]

In the spirit of https://github.com/dandi/dandi-api-webshots and https://github.com/datalad/datalad-usage-dashboard we should have a dashboard which would have

• summary on top which for each test (row) would list
  • # ok - number of dandisets/number of files in which it is all ok
  • # fail - dandisets/number of files hyperlinks leading to the status.yaml files so we could see details

I do not think we would need lengthy alternative "transpose" with row per dandiset but may be we will.

[jwodder]

@yarikoptic There is a README, generated according to the spec in #1. I simply failed to commit it at first.

[yarikoptic]

oh cool, then we would just need to have top summary added since otherwise it is impossible to grasp quickly if there is any error in some dandiset.

[jwodder]

@yarikoptic Could you show an example of what exactly you want the top summary to look like?

[yarikoptic]

some like

Test / (dandisets/files)	ok (80/10000)	fail (20/2000)
pynwb_open_load_ns	100/12000	-
matnwb_open_load	80 / 10000	20/2000: 000349/10 000350/4 ...