http method and status code doc added

docs/expressjs/13-http-methods-and-status-codes/13-http-methods-and-status-codes.md

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+---
+title: "HTTP methods and Status Codes"
+description: "HTTP methods and Status Codes"
+hide_table_of_contents: true
+---
+
+# HTTP methods and Status Codes
+
+## HTTP Methods
+
+### 🤔What is HTTP Methods ?
+
+HTTP Methods are **different ways to tell a server what action you want to perform** on a resource (data).
+
+### 🧐How It Work?
+
+<img src="/expressjs/13/2.jpg"  width="700px" />
+
+### 📋 List of HTTP Methods
+
+1. GET <br/>
+2. POST<br/>
+3. PUT<BR/>
+4. PATCH<BR/>
+5. DELETE<BR/>
+6. HEAD
+
+<img src="/expressjs/13/1.png"  width="700px" />
+
+1. **GET**
+
+   - **Purpose:** Retrieve data from the server (**read-only, no changes**)
+   - **Example:** Get a user profile
+
+2. **POST**
+
+   - **Purpose:** Send data to create a new resource (**create**)
+   - **Example:** Submit a form to register a user
+
+3. **PUT**
+
+   - **Purpose:** Replace the entire resource (**update completely**)
+   - **Example:** Update all details of a product
+
+4. **PATCH**
+
+   - **Purpose:** Modify part of a resource (**update partially**)
+   - **Example:** Change only the email of a user
+
+5. **DELETE**
+
+   - **Purpose:** Remove a resource
+   - **Example:** Delete a blog post
+
+6. **HEAD**
+   - **Purpose:** Same as GET, but only returns headers
+   - **Example:** Check if a file exists without downloading it
+
+## Status Codes
+
+### 🤔 What are Status Codes? ?
+
+HTTP Status Codes are **3-digit numbers sent by the server** to indicate the result of your request.  
+Think of them like traffic signals — they tell you if the request was successful, redirected, failed, or something else.
+
+#### 🔵 1xx: Informational
+
+- <b>Code</b> <br/>
+  100 - Continue <br/>
+  101 - Switching Protocols
+
+#### 🟢2xx: Success
+
+- <b>Code</b> <br/>
+  200 - OK <br/>
+  201 - Created (for POST/PUT) <br/>
+  204 - No Content (successful, no body)
+
+#### 🟡3xx: Redirection
+
+- <b>Code</b> <br/>
+  301 - Moved Permanently <br/>
+  302 - Found (Temporary Redirect) <br/>
+  304 - Not Modified
+
+#### 🔴4xx: Client Errors
+
+- <b>Code</b> <br/>
+  400 - Bad Request <br/>
+  401 - Unauthorized (login required) <br/>
+  403 - Forbidden (access denied) <br/>
+  404 - Not Found <br/>
+  409 - Conflict
+
+#### 🔴5xx: Server Errors
+
+- <b>Code</b> <br/>
+  500 - Internal Server Error <br/>
+  502 - Bad Gateway <br/>
+  503 - Service Unavailable
+
+## 📌 Real-Time Example
+
+#### Creating a user:
+
+**Scenario:** Creating a user
+
+**Method:** `POST`  
+**Request:** `/api/users`
+
+Possible Responses:
+
+- `201 Created` → User added successfully
+- `400 Bad Request` → Data is missing
+- `409 Conflict` → User already exists