Add a README for the CLI.

cli/README.md

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+# Nomadic Weather CLI
+
+Prototype for playing with [Open-Meteo](https://open-meteo.com).
+
+Locations need modified manually since it's still just a prototype.
+
+## prototype.js
+
+Got a little carried away and made it pretty formal.
+Still a prototype though since the locations are hardcoded.
+Would be made more complete by accepting a list of values, an env file,
+or basically just any way of handling the locations as user input.
+
+## install.sh
+
+Allows the script to be installed either in ~/bin/ or /usr/local/bin/.
+Also handles removal if it is no longer wanted.
+Currently does not remove from /usr/local/src/.