docs: create api documentation structure

Documentation.md

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+# Endpoint Name
+
+## Overview
+
+Brief description of the endpoint.
+
+## Endpoint
+
+```http
+METHOD /api/resource
+```
+
+## Authentication
+
+Required | Optional | None
+
+## Request
+
+### Headers
+
+| Header        | Required | Description  |
+| ------------- | -------- | ------------ |
+| Authorization | Yes      | Bearer token |
+
+### Query Parameters
+
+| Parameter | Type   | Required | Description |
+| --------- | ------ | -------- | ----------- |
+| page      | number | No       | Page number |
+
+### Request Body
+
+```json
+{
+  "example": "value"
+}
+```
+
+## Success Response
+
+**Status:** `200 OK`
+
+```json
+{
+  "success": true,
+  "data": {}
+}
+```
+
+## Error Responses
+
+### 400 Bad Request
+
+```json
+{
+  "success": false,
+  "error": "Validation failed"
+}
+```
+
+### 404 Not Found
+
+```json
+{
+  "success": false,
+  "error": "Resource not found"
+}
+```
+
+## Notes
+
+Additional implementation details.
+
+# API Error Reference
+
+## Standard Error Format
+
+```json
+{
+  "success": false,
+  "error": "Error description"
+}
+```
+
+## Common Status Codes
+
+| Status | Description           |
+| ------ | --------------------- |
+| 200    | Success               |
+| 201    | Resource created      |
+| 400    | Bad request           |
+| 401    | Unauthorized          |
+| 403    | Forbidden             |
+| 404    | Not found             |
+| 409    | Conflict              |
+| 422    | Validation error      |
+| 500    | Internal server error |
+
+## Example Validation Error
+
+```json
+{
+  "success": false,
+  "error": "Email format is invalid"
+}
+```