Improve the metadata with sections and screenshots

[namithj]

Need to improve the metadata structure by splitting it into sections, add an FAQ, Screenshots etc so that it looks organized like other plugins.

Taking a popular plugin as an example : https://fair.pm/packages/plugins/elementor/

FAIR Metadata : https://fair.pm/packages/plugins/fair-plugin/

This can be resolved in the metadata source of AC for the plugin.

[Ipstenu]

#299

We need a readme.txt with all this in the header.

[costdev]

@namithj @Ipstenu @afragen What about screenshots? Are there any that would be useful for prospective users to see before installing?

[afragen]

@costdev seems like another issue is needed, but I'm not sure what screenshots are even needed.

[costdev]

#335