feat: add a way to serve pure html (#730)

* feat: add a way to serve pure html

* add docs

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs_src/src/pages/documentation/api_reference/file-uploads.mdx

@@ -97,6 +97,49 @@ Batman scaled his application across multiple cores for better performance. He u
   </Col>
 </Row>
 
+
+### Serving simple HTML strings
+
+<Row>
+<Col>
+Speaking of HTML files, Batman wanted to serve simple HTML strings. He was suggested to use the following code:
+</Col>
+  <Col sticky>
+
+    <CodeGroup title="Request" tag="GET" label="/hello_world">
+
+    ```python {{ title: 'untyped' }}
+    from robyn import Robyn, serve_html
+
+    app = Robyn(__file__)
+
+
+    @app.get("/")
+    async def h(request):
+        return serve_html("./index.html")
+
+    app.start(port=8080)
+
+    ```
+
+    ```python {{ title: 'typed' }}
+    from robyn import Robyn, Request, serve_html
+
+    app = Robyn(__file__)
+
+
+    @app.get("/")
+    async def h(request: Request):
+        return serve_html("./index.html")
+
+    app.start(port=8080)
+
+    ```
+    </CodeGroup>
+  </Col>
+</Row>
+
+
 ### Serving Other Files
 
 

robyn/__init__.py

@@ -15,7 +15,7 @@
 from robyn.events import Events
 from robyn.logger import logger
 from robyn.processpool import run_processes
-from robyn.responses import serve_file, serve_html
+from robyn.responses import serve_file, serve_html, html
 from robyn.robyn import FunctionInfo, HttpMethod, Request, Response, get_version, jsonify, WebSocketConnector, Headers
 from robyn.router import MiddlewareRouter, MiddlewareType, Router, WebSocketRouter
 from robyn.types import Directory
@@ -450,6 +450,7 @@ def ALLOW_CORS(app: Robyn, origins: List[str]):
     "jsonify",
     "serve_file",
     "serve_html",
+    "html",
     "ALLOW_CORS",
     "SubRouter",
     "AuthenticationHandler",

robyn/responses.py

@@ -1,5 +1,16 @@
 from typing import Any, Dict
 
+from robyn.robyn import Response, Headers
+
+
+def html(html: str) -> Response:
+    """
+    This function will help in serving a simple html string
+
+    :param html str: html to serve as a response
+    """
+    return Response(description=html, status_code=200, headers=Headers({"Content-Type": "text/html"}))
+
 
 def serve_html(file_path: str) -> Dict[str, Any]:
     """