add plugin to support please

plugins/please/README.md

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+# please autocomplete plugin
+
+[Please](https://please.build) is a cross-language build system with an emphasis on high performance, extensibility and reproduceability. It supports a number of popular languages and can automate nearly any aspect of your build process.
+
+This plugin adds autocomplete and major aliases for `plz`, the command line tool for please.
+
+### Autocomplete
+* autocomplete `plz` commands
+* autocomplete build targets
+
+### Alias
+* `plz test` -> `pt`
+* `plz build` -> `pb`
+* `plz watch` -> `pw`
+
+### Maintainer
+[@thought-machine](https://github.com/thought-machine)

plugins/please/please.plugin.zsh

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+# Auto completion for plz, the command line tool for the please build system
+# For more details go to http://please.build
+#
+# Author: https://github.com/thought-machine
+
+if [ $commands[plz] ]; then
+    source <(plz --completion_script)
+fi
+
+alias pb='plz build'
+alias pt='plz test'
+alias pw='plz watch'