Update development.md

Author: deliahu

docs/contributing/development.md

@@ -1,5 +1,9 @@
 # Development
 
+## Notes
+
+* Unless your internet connection is very fast or you will only be working on the CLI, it is recommended to run your development environment on a cloud instance, e.g. an AWS EC2 instance or GCP VM (due to frequent docker registry pushing). There are a variety of ways to develop on a remote VM, feel free to reach out on our [gitter](https://gitter.im/cortexlabs/cortex) and we can point you in the right direction based on your operating system and editor preferences.
+
 ## Prerequisites
 
 1. Go (>=1.13.5)