Add readme for ccon

ccon/README.md

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+# ccon
+
+`ccon` is a currency converter.
+It uses the standard "units" utility.
+Once installed via the `units` package in most repositories, you may use `ccon` to avoid some of the weird syntaxes used by `units`.
+After installing `units`, run the `units_cur` command to get a current table of currency conversions.
+You may want to occasionally run `units_cur` again just to make sure you're up to date.
+
+To use this script, use the following format: `ccon <number of base currency> <base currency> <currency to convert to>`; examples:
+
+```bash
+$ ccon 1 USD CAD
+1.25
+$ ccon 1 CAD USD
+0.80
+$ ccon 1 CAD TWD
+22.08
+$ ccon 52 AUD GBP
+27.48
+$ ccon 22.37 USD NZD
+33.03
+```
+
+Have fun!