Added graphapi to the list of headless CMS

We are excited to be part of this list.

Author: Jeansse

src/site/headless-cms/graphapi.md

@@ -0,0 +1,25 @@
+---
+title: graphapi®
+homepage: https://graphapi.com
+twitter: graphapi_io
+opensource: "No"
+typeofcms: "API Driven"
+supportedgenerators:
+  - All
+description: A GraphQL API-based backend builder with built-in CMS capabilities for your Websites & Apps
+---
+## About graphapi®
+
+graphapi® is a secure low-code platform optimized for developer productivity and instant collaboration. 
+Its cloud automation backend with built-in CMS capabilities frees up development resources and empowers teams to build faster at scale. 
+
+## Useful Links to get Started with graphapi®
+
+#### Checkout our docs for more information:
+
+https://graphapi.com/docs/
+
+#### Sign up for a free account:
+
+https://my.graphapi.com/signup/
+