Add Backstage

Author: shano

readme.md

@@ -190,6 +190,7 @@
 - [Bluetooth Low Energy](https://github.com/dotintent/awesome-ble#readme) - Low-power wireless communication protocol ideal for IoT, wearables, and other battery-powered applications.
 - [Uno Platform](https://github.com/MartinZikmund/awesome-uno-platform#readme) - Open-source .NET UI platform for building cross-platform apps.
 - [Google Cloud](https://github.com/GoogleCloudPlatform/awesome-google-cloud#readme) - Cloud computing services by Google.
+- [Backstage](https://github.com/shano/awesome-backstage#readme) - Open-source developer portal platform for building Internal Developer Platforms (IDPs) that unify tools and workflows.
 
 ## Programming Languages