Add missing docs

Closes #574

docs/task-types/customfishing_fishing-(task-type).md

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+---
+title: customfishing_fishing
+parent: External task types
+grand_parent: Task types
+---
+
+# customfishing_fishing (task type)
+
+Not released yet (dev builds)
+{: .label .label-green }
+
+Plugin 'CustomFishing' required
+{: .label }
+
+Catch a set amount of CustomFishing loots.
+
+## Options
+
+| Key      | Description                          | Type    | Required | Default | Notes                                                              |
+|----------|--------------------------------------|---------|----------|---------|--------------------------------------------------------------------|
+| `amount` | The number of loots to catch.        | Integer | Yes      | \-      | \-                                                                 |
+| `loot`   | The specific loot id to catch.       | String  | No       | \-      | If this value is not specified, then any loot will count.          |
+| `group`  | The specific group of loot to catch. | String  | No       | \-      | If this value is not specified, then any group of loot will count. |
+
+## Examples
+
+Catch 10 CustomFishing loots:
+
+```yaml
+customfishing:
+  type: "customfishing_fishing"
+  amount: 10                             # number needed
+```