Add documentation

README.md

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+# Random Scripts
+A large collection of scripts that I use on my own computer. Many of these are
+called from other programs (like Emacs or River).
+
+I generally don't add any of these to `$PATH` directly. Instead I use the full
+path to refer to these. For example, my river init file uses a variable
+called `$SCRIPT_DIR` to find these.
+
+Some of these refer to specific HDMI or DP ports that I have things plugged
+into. These will probably not work out of the box if you copy any of these. You
+have been warned.