Added template files.

misc/Product_add-in_overview.md

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+# *Product* add-ins overview
+
+<!-- For an example, see [Word add-ins overview](https://dev.office.com/docs/add-ins/word/word-add-ins-programming-overview).
+
+-->
+
+<!-- Introduction:
+
+- Describe common scenarios.
+- Describe what add-ins can do.
+- Include an image of an add-in that illustrates scenario/best practices.
+- Specify target platforms.
+
+-->
+
+## *Product* add-in APIs
+
+<!-- Introduce the APIs used to develop add-ins, including client-specific APIs and Office.js. Explain the scenarios in which to use them. Link to relevant reference documentation.
+
+-->
+
+## Next steps
+
+<!-- Link to Getting started content and other relevant topics - Design, best practices, manifest documentation.
+
+-->
+
+## What's coming up for *Product* add-ins?
+
+<!-- Describe and link to APIs available on Open Spec page. Link to change log if applicable.
+
+-->
+
+## Additional resources
+
+- [Office Add-ins platform overview](../overview/office-add-ins.md)
+- *Link to product reference node*
+
+
+

misc/Product_add-in_reference.md

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+# *Product* JavaScript API reference
+
+<!-- For an example, see [Word JavaScript API reference](https://dev.office.com/reference/add-ins/word/word-add-ins-reference-overview).
+
+-->
+
+<!-- Introduction: Introduce the APIs, including the product-specific API and the shared office.js API.
+
+-->
+
+## *Product* JavaScript API
+
+<!-- Describe the product-specific API and programming model.
+
+--> 
+
+## JavaScript API for Office
+
+<!-- Describe how to reference office.js.
+
+-->
+
+## *Additional section(s) to include programming concepts/examples*
+
+<!-- Optional section to provide specifics and examples for developing with the API.
+
+-->
+
+## Open *Product* API specifications
+
+<!-- Optional. Link to the [Open API specifications](../../reference/openspec.md) page for details about new APIs in development.
+
+-->
+
+## Additional resources
+
+- [Office Add-ins platform overview](../../docs/overview/office-add-ins.md)
+- *Link to product conceptual node*
+- *Link to filtered code samples on GitHub, i.e. [Excel add-in samples on GitHub](https://github.com/OfficeDev?page=2&query=Excel&utf8=%E2%9C%93)*