Add additional information for a hd package

[LinuxSuRen]

Now, users can search a hd package via: hd search xxx. But in the real world, people might don't know the exact name, or they may want to search a package by category.

So, I'd like to suggest adding more additional information to it.

• category [optional]

How to use?

• hd search category:
• hd search * --category k8s
• hd search * --category *

Others

With this feature, we can generate a Markdown file to list all hd packages.