Add page for zsh

pages/common/zsh.md

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+# zsh
+
+> Z SHell.
+> `bash` and `sh`-compatible command line interpreter.
+
+- Start interactive command line interpreter:
+
+`zsh`
+
+- Execute command passed as parameter:
+
+`zsh -c {{command}}`
+
+- Run commands from file (script):
+
+`zsh {{file}}`
+
+- Run commands from file and print them as they are executed:
+
+`zsh -x {{file}}`