Update docs

Author: rlan

README.md

@@ -6,7 +6,7 @@
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-[Beancount Multitool](https://github.com/rlan/beancount-multitool/) is a command-line-interface (CLI) tool that converts financial data from financial institutions to Beancount files.
+[Beancount Multitool](https://github.com/rlan/beancount-multitool/) is a command-line-interface (CLI) tool that converts financial data from financial institutions to [Beancount](https://github.com/beancount/beancount) files.
 
 The following financial institutions are supported:
 

docs/usage/index.md

@@ -12,5 +12,6 @@ A typical workflow using the CLI tool with a Beancount ledger:
 
 * For quick start, choose [one](../institutions/index.md) of the financial institutions. Then modify the label-all-as-default example to match your Beacount ledger accounts.
 * For a simple example of using regular expression to label accounts, see the regular expression example for [JA Bank](../institutions/ja_bank.md).
+* For developers, see [here](../reference/development.md).
 * Learn about [configurations](configs.md) of `bean-mt` CLI tool.
 * Here are some [examples](examples.md) of common usage.