Commands documenting instructions.

docs/commands/README.md

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+# How do I get started?
+
+Pick any command from the checklist and write a comment acknowleding you started work.
+
+# Instructions for documenting a Nu command of your choosing
+
+Name the file after the command, like so:
+
+`command.md`
+
+Example: If you want to add documentation for the Nu command `enter`, create a file named `enter.md`, write documentation, save and create your pull request.
+
+# What kind of documentation should I write?
+
+Anything you want that you believe it *best* documents the command and the way you would like to see it. Here are some of our ideas of documentation we would *love* to see (feel free to add yours):
+
+* Examples of using the command (max creativity welcomed!)
+* Description of the command
+