Added plugin for tekton ci/cd CLI

plugins/tkn/README.md

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+# Tekton CLI
+
+This plugin provides autocompletion for [tkn](https://tekton.dev/docs/cli/). A command for easier interaction with Tekton CI/CD components.
+
+To use it, add `tkn` to the plugins array of your zshrc file:
+
+```bash
+plugins=(... tkn)
+```
+
+## See Also
+
++ [tektoncd/cli](https://github.com/tektoncd/cli)
+
+## Contributors
+
++ [jvarela01](https://github.com/jvarela01) - Plugin Author

plugins/tkn/tkn.plugin.zsh

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+# Autocompletion for tkn, the command line interface for Tekton Cloud Natice CI/CD (https://tekton.dev/)
+# Author: https://github.com/jvarela01
+
+if [ $commands[tkn] ]; then
+  source <(tkn completion zsh)
+  compdef _tkn tkn
+fi