[Context-generation] Extend the README.md file generation

[bohdan-harniuk]

Is your feature request related to a problem? Please describe.

We need to extend the README.md file generation through the context menu. For now it is raw and can be more useful.

Describe the solution you'd like (*)

1. We need to check, if the README.md file is already generated we should not show action.
2. We should add a new code include, to be able generate project-specific README.md files

Current content of the new code include will be:

<!---
    You can describe your module here.
    We recommend that you add the following information:
     - implementation details: why and how to use the module, preferably with some example scenarios
     - any dependencies (usually other modules but could be any important dependencies, libraries, etc)
     - extension points, APIs, plug-ins, etc
     - any introduced events
-->

Additional context

Mainline branch: 4.4.0-develop

[m2-assistant[bot]]

Hi @bohdan-harniuk. Thank you for your report. To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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[makzef]

@magento I am working on this