Update README

Change-type: patch
Signed-off-by: Kyle Harding <kyle@balena.io>

README.md

@@ -1,3 +1,31 @@
 # yocto-dev
 
 Shared Yocto development environment
+
+## Features
+
+- Yocto and OpenEmbedded build dependencies based on Ubuntu 18.04
+- SSH daemon background service w/ rotating logs
+- Fail2ban blocking IPs after failed login attempts
+- Docker daemon background service
+- Per-user home directories
+- Per-user SSH authorized keys synced with GitHub profiles
+
+## Planned Features
+
+- Update locking
+
+## Administration
+
+### Adding users
+
+1. Open [yocto-build-env/s6-overlay/scripts/addusers](yocto-build-env/s6-overlay/scripts/addusers) for editing
+2. Add GitHub username and new user ID to `user_ids`
+3. Open PR and merge
+
+### Removing users
+
+1. Open [yocto-build-env/s6-overlay/scripts/addusers](yocto-build-env/s6-overlay/scripts/addusers) for editing
+2. Remove GitHub username and user ID from `user_ids`
+3. Open PR and merge
+4. Optionally delete the associated home directory on device