chore: update readme

[Benehiko]

No description provided.

[Copilot]

Pull request overview

Updates the project README to reflect current repository metadata and client usage examples.

Changes:

• Remove outdated GitHub Actions build badge reference.
• Update license badge to Apache 2.0.
• Update the “query secrets” example to use GetSecrets and pattern parsing.

Comments suppressed due to low confidence (1)

README.md:45

• The updated Quickstart snippet calls c.GetSecrets(...), which returns a slice of envelopes, but the example still treats the result as a single object (resp.Value). Also t.Context() isn’t defined in this README snippet. Update the example to use a real context.Context (e.g. context.Background() or a ctx variable) and to handle the returned slice (e.g. select the first match or iterate).

resp, err := c.GetSecrets(t.Context(), client.MustParsePattern("my-secret"))
if err != nil {
    log.Fatalf("failed fetching secret: %v", err)
}
fmt.Println(resp.Value)

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