Add a basic plugin for pipx

plugins/pipx/README.md

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+# pipx
+
+[`pipx`](https://pipxproject.github.io/pipx/) - Install and Run Python Applications in Isolated Environments
+
+To use it, add `pipx` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... pipx)
+```
+
+## Installation
+
+Please find detailed installation guide [`here`](https://pipxproject.github.io/pipx/installation/)

plugins/pipx/pipx.plugin.zsh

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+# check if pipx is installed
+if (( ! ${+commands[pipx]} )); then
+  return
+fi
+
+autoload -U bashcompinit
+bashcompinit
+eval "$(register-python-argcomplete pipx)"