Improve Plugin Documentation

[RahiDroid]

Description

The current readme file doesn't give enough information about the plugin. If somebody tries to use the plugin as is on their WordPress website, the on-boarding wouldn't be very smooth.

Consider below list for example questions that could be answered in the readme file,

• [ ] What's the purpose/need of the plugin?
• [ ] When should one consider using this plugin?
• [ ] Why should one consider using this plugin?
• [ ] How exactly does it improve the CWV scores?
• [ ] Are there any potential disadvantages of using this plugin? Will this function the same in all environments?
• [ ] Are there any things that one should be cautious about while using this plugin?
• [ ] Why does it use the worker thread? Explain how that change is better? Is it always better?
• [ ] What are all the custom hooks provided by this plugin?
• [ ] How do I whitelist a script? Does it whitelist any scripts by default? Does the plugin have any recommendations on whitelisting a certain scripts in case the plugin breaks my WordPress website?

Please note: These are just examples of things that could be part of the readme file, feel free to remove or add more items. Could also consider adding a FAQ section.