added portkey to list.md (#953)

* added portkey to list.md

* Update docs/list.md

Co-authored-by: vimode <39148877+vimode@users.noreply.github.com>

---------

Co-authored-by: vimode <39148877+vimode@users.noreply.github.com>
Co-authored-by: Chandler Weiner <chandler@chandlerweiner.com>

docs/list.md

@@ -364,6 +364,16 @@ MIT-licensed open-source
 
 ### P
 
+#### **Portkey**
+
+- **Swag**: AirPods Pro (2nd generation), Portkey AI Swag Box, T-shirts and more.
+- **Requirements**:
+    - Make 2+ successful contributions to win a Portkey AI Swag Box with T-shirts and more.
+    - Top contributors will win a pair of AirPods Pro (2nd Generation).
+- **How to sign up**: No signup needed
+- **Issues**: Issues [tagged with hacktoberfest](https://github.com/Portkey-AI/gateway/issues?q=is%3Aopen+is%3Aissue+label%3Ahacktoberfest) label.
+- **Notes**: Visit [Portkey blog](https://portkey.ai/blog/portkey-hacktoberfest-24/) for more information.
+
 #### **Postiz**
 
 - **Swag**: T-shirt.