Added community (#25)

Add and update community channels

docs/index.mdx

@@ -14,3 +14,19 @@ If you can’t find answers to your questions in the docs, search for your answe
 ## Contribute to the docs
 
 These documents are also open-source and aim to help developers take their projects from conception to launch. Contributions to the docs are encouraged. You can file a pull request to add new content, suggest revisions to existing content using the edit icon at the top of each page, or submit suggestions, requests, and bug reports as issues in the [Docs GitHub Repo](https://github.com/stellar/new-docs/issues).
+
+## Developer community channels
+
+Get involved with the Stellar developer community- interact with other Stellar devs, keep up with ecosystem standards and protocol upgrades, and learn about upcoming workshops and events.
+
+[**Stellar Developer Discord**](https://discord.com/invite/zVYdY3ktTn)  
+Ask questions and engage with other Stellar devs.
+
+[**Stellar Developers Google Group**](https://groups.google.com/g/stellar-dev) 
+Discuss Core Advancement Proposals (CAPs) and Stellar Ecosystem Proposals (SEPs), talk about the development of Stellar Core and Horizon, and stay informed about important network upgrades.
+
+[**Stellar Stack Exchange**](https://stellar.stackexchange.com/) 
+A question and answer site for Stellar developers; if you can’t find what you’re looking for in the docs, try searching the Stack Exchange to see if your question has been addressed.  If it hasn't, feel free to ask!
+
+[**Developer Blog**](https://www.stellar.org/developers-blog) 
+Get the latest news and insights about building on Stellar.