pipx: add page (#4477)

pages/common/pipx.md

@@ -0,0 +1,20 @@
+# pipx
+
+> Install and run python applications in isolated environments.
+> More information: <https://github.com/pipxproject/pipx>.
+
+- Run an app in a temporary virtual environment:
+
+`pipx run {{pycowsay}} {{moo}}`
+
+- Install a package in a virtual environment and add entry points to path:
+
+`pipx install {{package}}`
+
+- List installed packages:
+
+`pipx list`
+
+- Run an app in a temporary virtual environment with a pakage name different from the executable:
+
+`pipx run --spec {{httpx-cli}} {{httpx}} {{http://www.github.com}}`