Add JFrog CLI plugin (#8250)

plugins/jfrog/README.md

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+# JFrog CLI
+
+This plugin provides completion for [JFrog CLI](https://github.com/jfrog/jfrog-cli).
+
+JFrog CLI provides a simple interface that automates access to [Artifactory](https://jfrog.com/artifactory), [Xray](https://jfrog.com/xray), [Bintray](https://jfrog.com/bintray) and [Mission Control](https://jfrog.com/mission-control) through their respective REST APIs.
+
+To use it, add `jfrog` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... jfrog)
+```

plugins/jfrog/jfrog.plugin.zsh

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+_jfrog() {
+	local -a opts
+	opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} --generate-bash-completion)}")
+	_describe 'values' opts
+	if [[ $compstate[nmatches] -eq 0 && $words[$CURRENT] != -* ]]; then
+		_files
+	fi
+}
+
+compdef _jfrog jfrog