Add draft docs for purchase history and order confirmation components (…

…#404)

pwa-devdocs/src/_drafts/venia-pwa-concept/component/order-confirmation/index.md

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+---
+title: OrderConfirmation component
+---
+
+| Description                | Reference image                               |
+| -------------------------- | :-------------------------------------------: |
+| Order confirmation         | ![Order confirmation]{:width="300px"}           |
+| **Order number** link      | ![Order number]{:width="300px"}           |
+| **Continue shopping** button   | ![Continue shopping button]{:width="300px"} |
+| **Create an account** button   | ![Create an account button]{:width="300px"} |
+{:style="table-layout:auto"}
+
+[Order confirmation]: {{site.baseurl}}{% link venia-pwa-concept/images/order-confirmation.png %}
+[Order number]: {{site.baseurl}}{% link venia-pwa-concept/images/order-number.png %}
+[Continue shopping button]: {{site.baseurl}}{% link venia-pwa-concept/images/continue-shopping-button.png %}
+[Create an account button]: {{site.baseurl}}{% link venia-pwa-concept/images/create-an-account-button.png %}
+
+## Interactions
+
+* **Continue shopping** button - On tap navigates the user to the page he came from.
+* **Create an account** button - On tap navigates the user to the account creation page.
+* **Order number** link - On tap navigates the user to the page of purchase he just made.

pwa-devdocs/src/_drafts/venia-pwa-concept/component/purchase-history/index.md

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+---
+title: PurchaseHistory component
+---
+
+| Description                | Reference image                               |
+| -------------------------- | :-------------------------------------------: |
+| Purchase history           | ![Purchase history]{:width="300px"}           |
+| Filter                     | ![Filter]{:width="300px"}                     |
+| Purchase history list item | ![Purchase history list item]{:width="300px"} |
+{:style="table-layout:auto"}
+
+[Purchase history]: {{site.baseurl}}{% link venia-pwa-concept/images/purchase-history.png %}
+[Filter]: {{site.baseurl}}{% link venia-pwa-concept/images/purchase-history-filter.png %}
+[Purchase history list item]: {{site.baseurl}}{% link venia-pwa-concept/images/purchase-history-item.png %}
+
+## Interactions
+
+* **Tap Item** - Navigates the user away from the purchase history and into the particular purchase history item page.
+* **Tap Filter** - Shows up filter adjustments menu