Add 'bash/usage_help.bash'

bash/usage_help.bash

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+Usage()
+{
+    echo -e "\nUsage: $(basename "$0") [-a|-b|-c]"
+    echo "Anything else you'd like to say, explain arguments, etc."
+}
+
+# Somewhere soon we do argument parsing and hit -h|--help:
+Usage           # Yes, it's that simple.
+
+# Or find an invalid argument:
+Usage           # Still easy, and now we've reused code.