add dml-pipe

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diff --git a/requirements/data_models/dml-pipe.md b/requirements/data_models/dml-pipe.md
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+# dml-pipe
+
+A pipe represents how much money the user wants to come in or go out of a
+bucket. In other words, it represents a flow of money from the tank to a bucket.
+
+| Field  | Type   | Description                                              |
+| ------ | ------ | -------------------------------------------------------- |
+| id     | string |                                                          |
+| amount | number | The amount of money flowing through the pipe.            |
+| period | string | How long it takes for `amount` to flow through the pipe. |
+
+Source: req-017