Update README.md

Author: QuantGeekDev

README.md

@@ -3,3 +3,71 @@ Automates getting coffee and snacks for tired devs
 
 
 <img src="https://imgur.com/tsIoR7w.png" alt="feed-a-dev logo" width="200px"/>
+# API Endpoints
+
+## Auth Routes
+| Method | Endpoint | Description | Auth Required | Request Body |
+|--------|----------|-------------|---------------|--------------|
+| POST | `/register` | Register new user (developer) | No | `{ "username": string, "password": string, "role": "developer" }` |
+| POST | `/register` | Register new user (project manager) | No | `{ "username": string, "password": string, "role": "project_manager" }` |
+| POST | `/login` | Authenticate user and get JWT | No | `{ "username": string, "password": string }` |
+
+## Snack Routes
+| Method | Endpoint | Description | Auth Required | Request Body |
+|--------|----------|-------------|---------------|--------------|
+| POST | `/snack` | Create new snack | Yes | `{ "name": string, "category": string, "price": decimal, "image_url": string }` |
+| PATCH | `/snack/{id}` | Update snack (owner/admin) | Yes | `{ "name"?: string, "category"?: string, "price"?: decimal, "image_url"?: string }` |
+| DELETE | `/snack/{id}` | Delete snack (owner/admin) | Yes | None |
+| GET | `/snacks` | List snacks (filtered by role) | Yes | None |
+
+## Relationship Routes
+| Method | Endpoint | Description | Auth Required | Request Body |
+|--------|----------|-------------|---------------|--------------|
+| POST | `/invite-pm` | Developer invites PM | Yes | `{ "project_manager_id": integer }` |
+| PATCH | `/respond-to-invite/{id}` | PM accepts/rejects invite | Yes | `{ "status": "accepted" \| "rejected" }` |
+| GET | `/my-developers` | PM lists accepted developers | Yes | None |
+
+## Authentication
+Use Bearer token in Authorization header:
+```
+Authorization: Bearer <jwt_token>
+```
+
+## Response Types
+
+### User
+```typescript
+{
+  id: number
+  username: string
+  role: "developer" | "project_manager" | "admin"
+  created_at: string
+  updated_at: string
+}
+```
+
+### Snack
+```typescript
+{
+  id: number
+  name: string
+  category: string
+  price: decimal
+  image_url: string
+  created_at: string
+  updated_at: string
+  user_id: number
+}
+```
+
+### Relationship
+```typescript
+{
+  id: number
+  developer_id: number
+  project_manager_id: number
+  status: "pending" | "accepted" | "rejected"
+  created_at: string
+  updated_at: string
+}
+```