docs: added file module docs (#7278)

www/apps/resources/references/file/classes/file.AbstractFileProviderService/page.mdx

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+---
+slug: /references/file-provider-module
+---
+
+import { TypeList } from "docs-ui"
+
+# How to Create a File Provider Module
+
+In this document, you’ll learn how to create a file provider module and the methods you must implement in it.
+
+---
+
+## 1. Create Module Directory
+
+Start by creating a new directory for your module. For example, `src/modules/my-file`.
+
+---
+
+## 2. Create the File Provider Service
+
+Create the file `src/modules/my-file/service.ts` that holds the implementation of the file service.
+
+The File Provider Module's main service must extend the `AbstractFileProviderService` class imported from `@medusajs/utils`:
+
+```ts title="src/modules/my-file/service.ts"
+import { AbstractFileProviderService } from "@medusajs/utils"
+
+class MyFileProviderService extends AbstractFileProviderService {
+  // TODO implement methods
+}
+
+export default MyFileProviderService
+```
+
+### constructor
+
+### getIdentifier
+
+#### Returns
+
+<TypeList types={[{"name":"any","type":"`any`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}  sectionTitle="getIdentifier"/>
+
+### upload
+
+#### Parameters
+
+<TypeList types={[{"name":"file","type":"`ProviderUploadFileDTO`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="upload"/>
+
+#### Returns
+
+<TypeList types={[{"name":"Promise","type":"Promise&#60;ProviderFileResultDTO&#62;","optional":false,"defaultValue":"","description":"","expandable":false,"children":[{"name":"ProviderFileResultDTO","type":"`ProviderFileResultDTO`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}]}  sectionTitle="upload"/>
+
+### delete
+
+#### Parameters
+
+<TypeList types={[{"name":"file","type":"`ProviderDeleteFileDTO`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="delete"/>
+
+#### Returns
+
+<TypeList types={[{"name":"Promise","type":"Promise&#60;void&#62;","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}  sectionTitle="delete"/>
+
+### getPresignedDownloadUrl
+
+#### Parameters
+
+<TypeList types={[{"name":"fileData","type":"`ProviderGetFileDTO`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="getPresignedDownloadUrl"/>
+
+#### Returns
+
+<TypeList types={[{"name":"Promise","type":"Promise&#60;string&#62;","optional":false,"defaultValue":"","description":"","expandable":false,"children":[{"name":"string","type":"`string`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}]}  sectionTitle="getPresignedDownloadUrl"/>
+
+---
+
+## 3. Create Module Definition File
+
+Create the file `src/modules/my-file/index.ts` with the following content:
+
+```ts title="src/modules/my-file/index.ts"
+import MyFileProviderService from "./service"
+
+export default {
+  service: MyFileProviderService,
+}
+```
+
+This exports the module's definition, indicating that the `MyFileProviderService` is the main service of the module.
+
+---
+
+## 4. Use Module
+
+To use your File Provider Module, add it to the `providers` array of the File Module:
+
+<Note>
+
+The File Module accepts one provider only.
+
+</Note>
+
+```js title="medusa-config.js"
+module.exports = {
+  // ...
+  modules: {
+    // ...
+    [Modules.FILE]: {
+      resolve: "@medusajs/file",
+      options: {
+        providers: [
+          {
+            resolve: "./dist/modules/my-file",
+            options: {
+              config: {
+                "my-file": {
+                  // provider options...
+                },
+              },
+            },
+          },
+        ],
+      },
+    },
+  },
+}
+```