docs: Add Services reference (#1548)

docs/content/references/services/classes/ProductCollectionService.md

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+# Class: ProductCollectionService
+
+Provides layer to manipulate product collections.
+
+## Hierarchy
+
+- `"medusa-interfaces"`
+
+  ↳ **`ProductCollectionService`**
+
+## Constructors
+
+### constructor
+
+• **new ProductCollectionService**(`__namedParameters`)
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `__namedParameters` | `Object` |
+
+#### Overrides
+
+BaseService.constructor
+
+#### Defined in
+
+[services/product-collection.js:11](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L11)
+
+## Methods
+
+### addProducts
+
+▸ **addProducts**(`collectionId`, `productIds`): `Promise`<`any`\>
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `collectionId` | `any` |
+| `productIds` | `any` |
+
+#### Returns
+
+`Promise`<`any`\>
+
+#### Defined in
+
+[services/product-collection.js:170](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L170)
+
+___
+
+### create
+
+▸ **create**(`collection`): `Promise`<`ProductCollection`\>
+
+Creates a product collection
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `collection` | `any` | the collection to create |
+
+#### Returns
+
+`Promise`<`ProductCollection`\>
+
+created collection
+
+#### Defined in
+
+[services/product-collection.js:104](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L104)
+
+___
+
+### delete
+
+▸ **delete**(`collectionId`): `Promise`<`any`\>
+
+Deletes a product collection idempotently
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `collectionId` | `string` | id of collection to delete |
+
+#### Returns
+
+`Promise`<`any`\>
+
+empty promise
+
+#### Defined in
+
+[services/product-collection.js:152](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L152)
+
+___
+
+### list
+
+▸ **list**(`selector?`, `config?`): `Promise`<`any`\>
+
+Lists product collections
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `selector` | `any` | the query object for find |
+| `config` | `any` | the config to be used for find |
+
+#### Returns
+
+`Promise`<`any`\>
+
+the result of the find operation
+
+#### Defined in
+
+[services/product-collection.js:206](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L206)
+
+___
+
+### listAndCount
+
+▸ **listAndCount**(`selector?`, `config?`): `Promise`<`any`\>
+
+Lists product collections and add count.
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `selector` | `any` | the query object for find |
+| `config` | `any` | the config to be used for find |
+
+#### Returns
+
+`Promise`<`any`\>
+
+the result of the find operation
+
+#### Defined in
+
+[services/product-collection.js:221](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L221)
+
+___
+
+### removeProducts
+
+▸ **removeProducts**(`collectionId`, `productIds`): `Promise`<`any`\>
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `collectionId` | `any` |
+| `productIds` | `any` |
+
+#### Returns
+
+`Promise`<`any`\>
+
+#### Defined in
+
+[services/product-collection.js:188](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L188)
+
+___
+
+### retrieve
+
+▸ **retrieve**(`collectionId`, `config?`): `Promise`<`ProductCollection`\>
+
+Retrieves a product collection by id.
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `collectionId` | `string` | the id of the collection to retrieve. |
+| `config` | `any` | the config of the collection to retrieve. |
+
+#### Returns
+
+`Promise`<`ProductCollection`\>
+
+the collection.
+
+#### Defined in
+
+[services/product-collection.js:55](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L55)
+
+___
+
+### retrieveByHandle
+
+▸ **retrieveByHandle**(`collectionHandle`, `config?`): `Promise`<`ProductCollection`\>
+
+Retrieves a product collection by id.
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `collectionHandle` | `string` | the handle of the collection to retrieve. |
+| `config` | `any` | query config for request |
+
+#### Returns
+
+`Promise`<`ProductCollection`\>
+
+the collection.
+
+#### Defined in
+
+[services/product-collection.js:81](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L81)
+
+___
+
+### update
+
+▸ **update**(`collectionId`, `update`): `Promise`<`ProductCollection`\>
+
+Updates a product collection
+
+#### Parameters
+
+| Name | Type | Description |
+| :------ | :------ | :------ |
+| `collectionId` | `string` | id of collection to update |
+| `update` | `any` | update object |
+
+#### Returns
+
+`Promise`<`ProductCollection`\>
+
+update collection
+
+#### Defined in
+
+[services/product-collection.js:125](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L125)
+
+___
+
+### withTransaction
+
+▸ **withTransaction**(`transactionManager`): [`ProductCollectionService`](ProductCollectionService.md)
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `transactionManager` | `any` |
+
+#### Returns
+
+[`ProductCollectionService`](ProductCollectionService.md)
+
+#### Defined in
+
+[services/product-collection.js:32](https://github.com/medusajs/medusa/blob/2d3e404f/packages/medusa/src/services/product-collection.js#L32)