add plugin "words countable"

[827652549]

This is a plugin to add word count for markdown files of docsify.

Summary

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

You have tested in the following browsers: (Providing a detailed version will be better.)

• Chrome
• Firefox
• Safari
• Edge
• IE

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

---

• DO NOT include files inside lib directory.

[anikethsaha]

Can you please add the link to awesome-docsify repo instead of here cause here we dont add many as it goes a long list

[Koooooo-7]

BTW:
code format countable.js and good code annotation in English for the sort of unification ours. 👍

[827652549]

I have formatted the code and replaced it with English annotation.thanks @Koooooo-7

[anikethsaha]

As I mentioned earlier , it has to be in awesome-docsify repo.
Closing this for now.
Please comment if anything needs to be changed in this