Readme clarifies the flow chart of injecting context

[ACTCD]

@Acobat12 No, the main reason I quoted #265 was to tell you that our current implementation is not force inject into the content context in all cases when there is an valid @grant.

For clarity, I drew this diagram for your reference:

flowchart LR
    A{"@inject-into"} -->|page| PAGE("page with none advanced APIs") -->|CSP violations| F{"@inject-into omit/auto?"}
    A -->|omit/auto| C{"any valid @grant?"}
    A -->|content| CONTENT(content with granted advanced APIs)
    C -->|omit/none| PAGE
    C -->|yes| CONTENT
    F -->|fallback| CONTENT

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Originally posted by @ACTCD in #945

We should add this diagram to the README document to reduce user friction and make it easier to understand.