docs: added entity reference (#2047)

* added entity reference

* chore: added github action

* added link to reference

docs/content/references/entities/classes/ProductTaxRate.md

@@ -0,0 +1,81 @@
+---
+displayed_sidebar: entitiesSidebar
+---
+
+# Class: ProductTaxRate
+
+## Constructors
+
+### constructor
+
+• **new ProductTaxRate**()
+
+## Properties
+
+### created\_at
+
+• **created\_at**: `Date`
+
+#### Defined in
+
+[models/product-tax-rate.ts:32](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L32)
+
+___
+
+### metadata
+
+• **metadata**: `Record`<`string`, `unknown`\>
+
+#### Defined in
+
+[models/product-tax-rate.ts:38](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L38)
+
+___
+
+### product
+
+• `Optional` **product**: [`Product`](Product.md)
+
+#### Defined in
+
+[models/product-tax-rate.ts:24](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L24)
+
+___
+
+### product\_id
+
+• **product\_id**: `string`
+
+#### Defined in
+
+[models/product-tax-rate.ts:17](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L17)
+
+___
+
+### rate\_id
+
+• **rate\_id**: `string`
+
+#### Defined in
+
+[models/product-tax-rate.ts:20](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L20)
+
+___
+
+### tax\_rate
+
+• `Optional` **tax\_rate**: [`TaxRate`](TaxRate.md)
+
+#### Defined in
+
+[models/product-tax-rate.ts:29](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L29)
+
+___
+
+### updated\_at
+
+• **updated\_at**: `Date`
+
+#### Defined in
+
+[models/product-tax-rate.ts:35](https://github.com/medusajs/medusa/blob/0703dd94e/packages/medusa/src/models/product-tax-rate.ts#L35)